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9.1
CRITICAL CVSS 3.1
CVE-2026-20310
Cisco SD-WAN Software Security Hardening Release - Improper Link Resolution Before File Access
Overview
Description

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Catalyst SD-WAN engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20310 are related to improper link resolution before file access issues that are grouped under the Common Weakness Enumeration (CWE) CWE-59.

Details
INFO

Published Date :

Aug. 5, 2026, 5:16 p.m.

Last Modified :

Aug. 5, 2026, 6:17 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Impact
Affected Products

The following products are affected by CVE-2026-20310 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.

ID Vendor Product Action
1 Cisco catalyst_sd-wan_manager
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 134c704f-9b21-4f2e-91b3-4a467353bcc0
CVSS 3.1 CRITICAL [email protected]
Solution
Update Cisco Catalyst SD-WAN software to address improper link resolution vulnerabilities.
  • Update Cisco Catalyst SD-WAN software to the latest release.
  • Apply the security hardening releases provided by Cisco.
References
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-2026-20310.

URL Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-sdwan-faLcR3K
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-20310 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-2026-20310 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).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-20310 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-20310 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 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Aug. 05, 2026

    Action Type Old Value New Value
    Added SSVC {'id': 'CVE-2026-20310', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-05T17:35:34.165306Z'}
  • New CVE Received by [email protected]

    Aug. 05, 2026

    Action Type Old Value New Value
    Added Affected [{'vendor': 'Cisco', 'product': 'Cisco Catalyst SD-WAN Controller', 'versions': [{'status': 'affected', 'version': '20.6.4'}, {'status': 'affected', 'version': '20.9.2'}, {'status': 'affected', 'version': '20.3.6'}, {'status': 'affected', 'version': '20.7.2'}, {'status': 'affected', 'version': '20.7.1'}, {'status': 'affected', 'version': '20.5.1'}, {'status': 'affected', 'version': '20.6.2'}, {'status': 'affected', 'version': '19.3.0'}, {'status': 'affected', 'version': '20.6.1'}, {'status': 'affected', 'version': '17.2.4'}, {'status': 'affected', 'version': '18.2.0'}, {'status': 'affected', 'version': '18.4.6'}, {'status': 'affected', 'version': '19.1.0'}, {'status': 'affected', 'version': '19.2.4'}, {'status': 'affected', 'version': '19.2.929'}, {'status': 'affected', 'version': '18.3.8'}, {'status': 'affected', 'version': '18.4.303'}, {'status': 'affected', 'version': '18.3.7'}, {'status': 'affected', 'version': '18.4.1'}, {'status': 'affected', 'version': '19.2.097'}, {'status': 'affected', 'version': '19.2.0'}, {'status': 'affected', 'version': '19.2.099'}, {'status': 'affected', 'version': '18.3.6'}, {'status': 'affected', 'version': '20.4.2'}, {'status': 'affected', 'version': '19.0.0'}, {'status': 'affected', 'version': '20.9.1'}, {'status': 'affected', 'version': '20.3.5'}, {'status': 'affected', 'version': '20.3.1'}, {'status': 'affected', 'version': '18.3.5'}, {'status': 'affected', 'version': '20.6.3'}, {'status': 'affected', 'version': '18.4.3'}, {'status': 'affected', 'version': '18.4.4'}, {'status': 'affected', 'version': '18.3.3'}, {'status': 'affected', 'version': '17.2.8'}, {'status': 'affected', 'version': '20.8.1'}, {'status': 'affected', 'version': '19.2.32'}, {'status': 'affected', 'version': '19.2.2'}, {'status': 'affected', 'version': '17.2.5'}, {'status': 'affected', 'version': '18.4.0'}, {'status': 'affected', 'version': '20.4.1.1'}, {'status': 'affected', 'version': '20.1.3'}, {'status': 'affected', 'version': '20.1.2'}, {'status': 'affected', 'version': '17.2.10'}, {'status': 'affected', 'version': '19.2.098'}, {'status': 'affected', 'version': '20.1.1'}, {'status': 'affected', 'version': '17.2.6'}, {'status': 'affected', 'version': '19.2.1'}, {'status': 'affected', 'version': '18.3.4'}, {'status': 'affected', 'version': '20.4.1'}, {'status': 'affected', 'version': '17.2.9'}, {'status': 'affected', 'version': '19.2.31'}, {'status': 'affected', 'version': '19.0.1a'}, {'status': 'affected', 'version': '18.3.0'}, {'status': 'affected', 'version': '17.2.7'}, {'status': 'affected', 'version': '18.4.5'}, {'status': 'affected', 'version': '20.3.4'}, {'status': 'affected', 'version': '20.3.3'}, {'status': 'affected', 'version': '20.4.1.2'}, {'status': 'affected', 'version': '20.3.2'}, {'status': 'affected', 'version': '18.3.1'}, {'status': 'affected', 'version': '20.1.12'}, {'status': 'affected', 'version': '19.2.3'}, {'status': 'affected', 'version': '20.10.1'}, {'status': 'affected', 'version': '20.6.5'}, {'status': 'affected', 'version': '20.3.7'}, {'status': 'affected', 'version': '20.9.3'}, {'status': 'affected', 'version': '20.11.1'}, {'status': 'affected', 'version': '20.6.3.2'}, {'status': 'affected', 'version': '20.4.2.3'}, {'status': 'affected', 'version': '20.3.5.1'}, {'status': 'affected', 'version': '20.3.4.3'}, {'status': 'affected', 'version': '20.9.3.1'}, {'status': 'affected', 'version': '20.6.4.1'}, {'status': 'affected', 'version': '20.3.3.2'}, {'status': 'affected', 'version': '20.6.5.2'}, {'status': 'affected', 'version': '20.3.7.1'}, {'status': 'affected', 'version': '20.11.1.1'}, {'status': 'affected', 'version': '20.10.1.1'}, {'status': 'affected', 'version': '20.6.1.2'}, {'status': 'affected', 'version': '20.1.3.1'}, {'status': 'affected', 'version': '20.9.2.2'}, {'status': 'affected', 'version': '20.6.5.3'}, {'status': 'affected', 'version': '20.6.3.3'}, {'status': 'affected', 'version': '20.3.7.2'}, {'status': 'affected', 'version': '20.6.5.4'}, {'status': 'affected', 'version': '20.9.2.3'}, {'status': 'affected', 'version': '20.9.4'}, {'status': 'affected', 'version': '20.12.1'}, {'status': 'affected', 'version': '20.3.8'}, {'status': 'affected', 'version': '20.6.6'}, {'status': 'affected', 'version': '20.12.2'}, {'status': 'affected', 'version': '20.13.1'}, {'status': 'affected', 'version': '20.9.5'}, {'status': 'affected', 'version': '20.12.3'}, {'status': 'affected', 'version': '20.6.7'}, {'status': 'affected', 'version': '20.9.5.1'}, {'status': 'affected', 'version': '20.14.1'}, {'status': 'affected', 'version': '20.12.3.1'}, {'status': 'affected', 'version': '20.12.4'}, {'status': 'affected', 'version': '20.15.1'}, {'status': 'affected', 'version': '20.9.6'}, {'status': 'affected', 'version': '20.6.8'}, {'status': 'affected', 'version': '20.16.1'}, {'status': 'affected', 'version': '20.9.5.3'}, {'status': 'affected', 'version': '20.12.4.1'}, {'status': 'affected', 'version': '20.15.2'}, {'status': 'affected', 'version': '20.12.5'}, {'status': 'affected', 'version': '20.9.7'}, {'status': 'affected', 'version': '20.15.3'}, {'status': 'affected', 'version': '20.12.5.1'}, {'status': 'affected', 'version': '20.12.5.2'}, {'status': 'affected', 'version': '20.15.4'}, {'status': 'affected', 'version': '20.9.7.1'}, {'status': 'affected', 'version': '20.18.1'}, {'status': 'affected', 'version': '20.12.6'}, {'status': 'affected', 'version': '20.9.8'}, {'status': 'affected', 'version': '20.15.4.1'}, {'status': 'affected', 'version': '20.18.2'}, {'status': 'affected', 'version': '26.1.1'}, {'status': 'affected', 'version': '20.15.4.2'}, {'status': 'affected', 'version': '20.18.2.1'}, {'status': 'affected', 'version': '20.12.5.3'}, {'status': 'affected', 'version': '20.12.6.1'}, {'status': 'affected', 'version': '20.9.8.2'}, {'status': 'affected', 'version': '20.15.5'}, {'status': 'affected', 'version': '20.18.3'}, {'status': 'affected', 'version': '20.12.7'}, {'status': 'affected', 'version': '20.9.9'}, {'status': 'affected', 'version': '20.18.2.2'}, {'status': 'affected', 'version': '20.12.5.4'}, {'status': 'affected', 'version': '20.12.7.1'}, {'status': 'affected', 'version': '20.15.5.1'}, {'status': 'affected', 'version': '20.15.4.3'}, {'status': 'affected', 'version': '20.12.6.2'}, {'status': 'affected', 'version': '20.15.5.2'}, {'status': 'affected', 'version': '20.15.4.4'}, {'status': 'affected', 'version': '26.1.1.1'}, {'status': 'affected', 'version': '20.9.9.1'}, {'status': 'affected', 'version': '20.18.3.1'}, {'status': 'affected', 'version': '26.1.1.2'}, {'status': 'affected', 'version': '20.15.4.5'}, {'status': 'affected', 'version': '20.15.5.3'}, {'status': 'affected', 'version': '20.12.7.2'}, {'status': 'affected', 'version': '20.9.9.2'}], 'defaultStatus': 'unknown'}, {'vendor': 'Cisco', 'product': 'Cisco Catalyst SD-WAN Manager', 'versions': [{'status': 'affected', 'version': '20.1.12'}, {'status': 'affected', 'version': '19.2.1'}, {'status': 'affected', 'version': '18.4.4'}, {'status': 'affected', 'version': '18.4.5'}, {'status': 'affected', 'version': '20.1.1.1'}, {'status': 'affected', 'version': '20.1.1'}, {'status': 'affected', 'version': '19.3.0'}, {'status': 'affected', 'version': '19.2.2'}, {'status': 'affected', 'version': '19.2.099'}, {'status': 'affected', 'version': '18.3.6'}, {'status': 'affected', 'version': '18.3.7'}, {'status': 'affected', 'version': '19.2.0'}, {'status': 'affected', 'version': '18.3.8'}, {'status': 'affected', 'version': '19.0.0'}, {'status': 'affected', 'version': '19.1.0'}, {'status': 'affected', 'version': '18.4.302'}, {'status': 'affected', 'version': '18.4.303'}, {'status': 'affected', 'version': '19.2.097'}, {'status': 'affected', 'version': '19.2.098'}, {'status': 'affected', 'version': '17.2.10'}, {'status': 'affected', 'version': '18.3.6.1'}, {'status': 'affected', 'version': '19.0.1a'}, {'status': 'affected', 'version': '18.2.0'}, {'status': 'affected', 'version': '18.4.3'}, {'status': 'affected', 'version': 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'affected', 'version': '20.6.2.0.4'}, {'status': 'affected', 'version': '20.4.2.2.3'}, {'status': 'affected', 'version': '20.3.4.0.24'}, {'status': 'affected', 'version': '20.6.2.2.7'}, {'status': 'affected', 'version': '20.6.3'}, {'status': 'affected', 'version': '20.3.4.2.2'}, {'status': 'affected', 'version': '20.4.2.2.4'}, {'status': 'affected', 'version': '20.7.1.0.2'}, {'status': 'affected', 'version': '20.8.1'}, {'status': 'affected', 'version': '20.3.5.0.8'}, {'status': 'affected', 'version': '20.3.5.0.9'}, {'status': 'affected', 'version': '20.4.2.2.8'}, {'status': 'affected', 'version': '20.3.5.0.7'}, {'status': 'affected', 'version': '20.6.3.0.7'}, {'status': 'affected', 'version': '20.6.3.0.5'}, {'status': 'affected', 'version': '20.6.3.0.10'}, {'status': 'affected', 'version': '20.6.3.0.2'}, {'status': 'affected', 'version': '20.7.2'}, {'status': 'affected', 'version': '20.9.1EFT2'}, {'status': 'affected', 'version': '20.6.3.0.11'}, {'status': 'affected', 'version': '20.6.3.1'}, {'status': 'affected', 'version': '20.6.3.0.14'}, {'status': 'affected', 'version': '20.6.4'}, {'status': 'affected', 'version': '20.9.1'}, {'status': 'affected', 'version': '20.6.3.0.19'}, {'status': 'affected', 'version': '20.6.3.0.18'}, {'status': 'affected', 'version': '20.3.6'}, {'status': 'affected', 'version': '20.9.1.1'}, {'status': 'affected', 'version': '20.6.3.0.23'}, {'status': 'affected', 'version': '20.6.4.0.4'}, {'status': 'affected', 'version': '20.6.3.0.25'}, {'status': 'affected', 'version': '20.6.5'}, {'status': 'affected', 'version': '20.6.3.0.27'}, {'status': 'affected', 'version': '20.9.2'}, {'status': 'affected', 'version': '20.9.2.1'}, {'status': 'affected', 'version': '20.6.3.0.29'}, {'status': 'affected', 'version': '20.6.3.0.31'}, {'status': 'affected', 'version': '20.6.3.0.32'}, {'status': 'affected', 'version': '20.10.1'}, {'status': 'affected', 'version': '20.6.3.0.33'}, {'status': 'affected', 'version': '20.9.2.0.01'}, {'status': 'affected', 'version': '20.9.1_LI_Images'}, {'status': 'affected', 'version': '20.10.1_LI_Images'}, {'status': 'affected', 'version': '20.9.2_LI_Images'}, {'status': 'affected', 'version': '20.3.7'}, {'status': 'affected', 'version': '20.9.3'}, {'status': 'affected', 'version': '20.6.5.1'}, {'status': 'affected', 'version': '20.11.1'}, {'status': 'affected', 'version': '20.11.1_LI_Images'}, {'status': 'affected', 'version': '20.9.3_LI_ Images'}, {'status': 'affected', 'version': '20.6.3.1.1'}, {'status': 'affected', 'version': '20.9.3.0.2'}, {'status': 'affected', 'version': '20.6.5.1.2'}, {'status': 'affected', 'version': '20.9.3.0.3'}, {'status': 'affected', 'version': '20.4.2.3'}, {'status': 'affected', 'version': '20.6.3.2'}, {'status': 'affected', 'version': '20.6.4.1'}, {'status': 'affected', 'version': '20.6.3.0.38'}, {'status': 'affected', 'version': '20.6.3.0.39'}, {'status': 'affected', 'version': '20.3.5.1'}, {'status': 'affected', 'version': '20.3.4.3'}, {'status': 'affected', 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    Added Description As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Catalyst SD-WAN engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20310 are related to improper link resolution before file access issues that are grouped under the Common Weakness Enumeration (CWE) CWE-59.
    Added CVSS V3.1 AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
    Added CWE CWE-59
    Added Reference https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-sdwan-faLcR3K
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 9.1
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact