CVE-2026-20127
Cisco Catalyst SD-WAN Controller and Manager Authentication Bypass Vulnerability - [Actively Exploited]
Description
A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, and Cisco Catalyst SD-WAN Validator, formerly SD-WAN vBond, could allow an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system. This vulnerability exists because the peering authentication mechanism in an affected system is not working properly. An attacker could exploit this vulnerability by sending crafted requests to an affected system. A successful exploit could allow the attacker to log in to an affected Cisco Catalyst SD-WAN Controller as an internal, high-privileged, non-root user account. Using this account, the attacker could access NETCONF, which would then allow the attacker to manipulate network configuration for the SD-WAN fabric.
INFO
Published Date :
Feb. 25, 2026, 5:25 p.m.
Last Modified :
June 16, 2026, 7:16 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, and Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, contain an authentication bypass vulnerability could allow an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system. This vulnerability exists because the peering authentication mechanism in an affected system is not working properly. An attacker could exploit this vulnerability by sending crafted requests to an affected system. A successful exploit could allow the attacker to log in to an affected Cisco Catalyst SD-WAN Controller as an internal, high-privileged, non-root user account. Using this account, the attacker could access NETCONF, which would then allow the attacker to manipulate network configuration for the SD-WAN fabric.
Please adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlines in CISA’s Emergency Directive 26-03 (URL listed below in Notes) and CISA’s “Hunt & Hardening Guidance for Cisco SD-WAN Devices (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
Unknown
CISA Mitigation Instructions: https://www.cisa.gov/news-events/directives/ed-26-03-mitigate-vulnerabilities-cisco-sd-wan-systems ; https://www.cisa.gov/news-events/directives/supplemental-direction-ed-26-03-hunt-and-hardening-guidance-cisco-sd-wan-systems ; https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk ; https://nvd.nist.gov/vuln/detail/CVE-2026-20127
Affected Products
The following products are affected by CVE-2026-20127
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Apply vendor-supplied security updates for Cisco Catalyst SD-WAN.
- Implement strict access controls for network management interfaces.
- Monitor systems for suspicious authentication attempts.
- Review and restrict NETCONF access privileges.
Public PoC/Exploit Available at Github
CVE-2026-20127 has a 17 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-20127.
| URL | Resource |
|---|---|
| https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk | Vendor Advisory |
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20127 | US Government Resource |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-20127 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-20127
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
CVE-2026-20127
C++
None
None
C++
An exploit for the Cisco Catalyst SD-WAN Controller authentication bypass vulnerability, CVE-2026-20127
Ruby
Cisco SD-WAN Exposure & Potential Vulnerability Scanner (Passive Fingerprinting) 2026
Python
None
Python Java
Cisco Catalyst SD-WAN 身份验证绕过漏洞(CVE-2026-20127)利用EXP
Java Python
CVE-2026‑20127 – Remote Authentication Bypass for Cisco Catalyst SD‑WAN
cve-2026-20127 cisco-sd-wan-rce cisco
Python Java
None
Python Java
None
Python Dockerfile
None
Rust Python
None
Shell
None
Python Shell TypeScript JavaScript Go Rust HTML EJS Svelte
BlueFalconInk CISA ED 26-03 Compliance Tracker - Rapid-response Streamlit app for Cisco SD-WAN vulnerability mitigation (CVE-2026-20127, CVE-2022-20775)
Dockerfile Python
None
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-20127 vulnerability anywhere in the article.
-
The Cyber Express
CVE-2026-20245 Zero-Day Exploited in Cisco Catalyst SD-WAN Manager to Gain Root Access
A newly disclosed zero-day vulnerability, CVE-2026-20245, has been exploited by a threat actor targeting Cisco Catalyst SD-WAN Manager. By exploiting a flaw in the platform’s file to upload functional ... Read more
-
The Hacker News
Cisco Catalyst SD-WAN Zero-Day CVE-2026-20245 Exploited to Gain Root Access
An unknown threat actor exploited a recently disclosed high-severity security flaw impacting Cisco Catalyst SD-WAN as a zero-day at least two months before it was publicly disclosed, according to new ... Read more
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The Hacker News
ThreatsDay Bulletin: Claude Chat Abuse, NastyC2 npm Packages, Device-Code Phishing + 25 More Stories
The internet did not break this week. It got used exactly as designed, which is worse.Searches were siphoned through shady browser add-ons. AI chat links turned into malware delivery paths. macOS atta ... Read more
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The Hacker News
Cisco Releases Security Updates for Actively Exploited SD-WAN Manager Flaw
Cisco has released security updates for a medium-severity security flaw in Catalyst SD-WAN Manager that has come under active exploitation in the wild. The vulnerability, tracked as CVE-2026-20262, ca ... Read more
-
TheCyberThrone
CISA adds Cisco SD-WAN and LiteSpeed cPanel to KEV
June 16, 2026CVE-2026-20262 | Cisco Catalyst SD-WAN Manager — Path TraversalCVE-2026-20262 is a directory or path traversal vulnerability in Cisco Catalyst SD-WAN Manager. This class of flaw allows at ... Read more
-
TheCyberThrone
CISA KEV Update — Cisco Catalyst SD-WAN, Google Chrome V8 & Arista EOS
CISA added three new vulnerabilities to its Known Exploited Vulnerabilities catalog on June 9, 2026: CVE-2026-20245 (Cisco Catalyst SD-WAN Manager), CVE-2026-11645 (Google Chromium V8), and CVE-2026-7 ... Read more
-
The Cyber Express
Cisco Warns of Active Exploitation of Catalyst SD-WAN Flaw With No Patch Available
Cisco has issued an urgent warning that a high-severity vulnerability in its Catalyst SD-WAN Manager platform is being actively exploited in the wild—and no patch exists yet. CVE-2026-20245 allows aut ... Read more
-
TheCyberThrone
CVE-2026-20245 — Cisco Catalyst SD-WAN Manager Privilege Escalation
June 6, 2026The Core FlawCVE-2026-20245 affects the command-line interface of Cisco Catalyst SD-WAN Manager and stems from insufficient validation of user-supplied input. An authenticated local attack ... Read more
-
The Hacker News
Cisco Catalyst SD-WAN Manager CVE-2026-20245 Flaw Actively Exploited – No Patch Available
Cisco has warned that a high-severity security flaw impacting Catalyst SD-WAN Manager has come under active exploitation. The vulnerability, tracked as CVE-2026-20245, carries a CVSS score of 7.8 out ... Read more
-
security.nl
Cisco waarschuwt voor actief misbruikt beveiligingslek in SD-WAN Manager
Cisco waarschuwt voor een actief misbruikt beveiligingslek in Cisco Catalyst SD-WAN Manager waardoor een aanvaller met toegang tot het systeem willekeurige commando's als root kan uitvoeren. Er zijn u ... Read more
-
CybersecurityNews
Cisco SD-WAN Vulnerability Exploited in the Wild to Execute Arbitrary Commands as Root User
Cisco has disclosed a high-severity vulnerability in its Catalyst SD-WAN Manager that is actively being exploited in the wild, allowing attackers to execute arbitrary commands with root privileges. Th ... Read more
-
TheCyberThrone
CVE-2026-20182 – Cisco Catalyst SD-WAN Auth Bypass to KEV
OverviewCVE-2026-20182 carries a CVSSv3.1 score of 10.0 (Critical) and is classified under CWE-287: Improper Authentication. The flaw affects the Cisco Catalyst SD-WAN Controller (formerly vSmart), wh ... Read more
-
The Hacker News
CISA Adds Cisco SD-WAN CVE-2026-20182 to KEV After Admin Access Exploits
The U.S.Cybersecurity and Infrastructure Security Agency (CISA) on Thursday added a newly disclosed vulnerability impacting Cisco Catalyst SD-WAN Controller to its Known Exploited Vulnerabilities (KEV ... Read more
-
CybersecurityNews
Cisco Catalyst SD-WAN Controller 0-Day Actively Exploited to Gain Admin Access
A maximum-severity zero-day vulnerability in Cisco Catalyst SD-WAN Controller is being actively exploited in the wild, allowing unauthenticated remote attackers to fully bypass authentication and seiz ... Read more
-
The Hacker News
Cisco Catalyst SD-WAN Controller Auth Bypass Actively Exploited to Gain Admin Access
Cisco has released updates to address a maximum-severity authentication bypass flaw in Catalyst SD-WAN Controller that it said has been exploited in limited attacks. The vulnerability, tracked as CVE- ... Read more
-
Daily CyberSecurity
Critical Zero-Day: Unauthenticated RCE Exploited in Weaver E-cology 10.0
A critical security vulnerability, tracked as CVE-2026-22679, has been identified in Weaver (Fanwei) E-cology 10.0, one of the most widely used enterprise collaborative office platforms. With a CVSS s ... Read more
-
The Hacker News
Cisco Patches 9.8 CVSS IMC and SSM Flaws Allowing Remote System Compromise
Cisco has released updates to address a critical security flaw in the Integrated Management Controller (IMC) that, if successfully exploited, could allow an unauthenticated, remote attacker to bypass ... Read more
-
Help Net Security
Cisco FMC flaw was exploited by Interlock weeks before patch (CVE-2026-20131)
A critical vulnerability (CVE-2026-20131) in Cisco Secure Firewall Management Center (FMC) that Cisco disclosed and patched in early March 2026 has been exploited as a zero-day by the Interlock ransom ... Read more
-
Hackread - Cybersecurity News, Data Breaches, AI and More
US Agencies Face CISA Deadline Over Critical Cisco SD-WAN Flaw
US government departments are facing a major deadline in a high-stakes effort to reclaim their networks from intruders who have been hiding in the system for years. This intensive cleanup follows the ... Read more
-
security.nl
Amerikaanse overheid moet Cisco SD-WAN-logs met cyberagentschap delen
Amerikaanse overheidsinstanties moeten de logs van hun Cisco SD-WAN-systemen met het Amerikaanse cyberagentschap CISA delen. Het CISA heeft hiervoor een nieuw noodbevel afgegeven. Aanleiding is actief ... Read more
The following table lists the changes that have been made to the
CVE-2026-20127 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Jun. 16, 2026
Action Type Old Value New Value Changed Description A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, and Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, could allow an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system. This vulnerability exists because the peering authentication mechanism in an affected system is not working properly. An attacker could exploit this vulnerability by sending crafted requests to an affected system. A successful exploit could allow the attacker to log in to an affected Cisco Catalyst SD-WAN Controller as an internal, high-privileged, non-root user account. Using this account, the attacker could access NETCONF, which would then allow the attacker to manipulate network configuration for the SD-WAN fabric. A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, and Cisco Catalyst SD-WAN Validator, formerly SD-WAN vBond, could allow an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system. This vulnerability exists because the peering authentication mechanism in an affected system is not working properly. An attacker could exploit this vulnerability by sending crafted requests to an affected system. A successful exploit could allow the attacker to log in to an affected Cisco Catalyst SD-WAN Controller as an internal, high-privileged, non-root user account. Using this account, the attacker could access NETCONF, which would then allow the attacker to manipulate network configuration for the SD-WAN fabric. -
Initial Analysis by [email protected]
Feb. 26, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Added CWE CWE-287 Added CPE Configuration OR *cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:* versions up to (excluding) 20.9.8.2 *cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:* versions from (including) 20.11 up to (excluding) 20.12.5.3 *cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:* versions from (including) 20.13 up to (excluding) 20.15.4.2 *cpe:2.3:a:cisco:catalyst_sd-wan_manager:*:*:*:*:*:*:*:* versions from (including) 20.16 up to (excluding) 20.18.2.1 *cpe:2.3:a:cisco:catalyst_sd-wan_manager:20.12.6:*:*:*:*:*:*:* *cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:* versions up to (excluding) 20.9.8.2 *cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:* versions from (including) 20.11 up to (excluding) 20.12.5.3 *cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:* versions from (including) 20.13 up to (excluding) 20.15.4.2 *cpe:2.3:a:cisco:sd-wan_vsmart_controller:*:*:*:*:*:*:*:* versions from (including) 20.16 up to (excluding) 20.18.2.1 *cpe:2.3:a:cisco:sd-wan_vsmart_controller:20.12.6:*:*:*:*:*:*:* Added Reference Type Cisco Systems, Inc.: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk Types: Vendor Advisory Added Reference Type CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20127 Types: US Government Resource -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Feb. 25, 2026
Action Type Old Value New Value Added Reference https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20127 -
New CVE Received by [email protected]
Feb. 25, 2026
Action Type Old Value New Value Added Description A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, and Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, could allow an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system. This vulnerability exists because the peering authentication mechanism in an affected system is not working properly. An attacker could exploit this vulnerability by sending crafted requests to an affected system. A successful exploit could allow the attacker to log in to an affected Cisco Catalyst SD-WAN Controller as an internal, high-privileged, non-root user account. Using this account, the attacker could access NETCONF, which would then allow the attacker to manipulate network configuration for the SD-WAN fabric. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Added CWE CWE-287 Added Reference https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk