4.3
MEDIUM
CVSS 3.1
CVE-2026-20308
Cisco IOS XE Software Web-Based Management Interface Vulnerability
Overview
Description
A vulnerability in the web-based management interface of Cisco IOS XE Software could allow an authenticated, remote attacker with low privileges to perform a denial of service (DoS) attack against an affected device. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending crafted input to the web-based management interface of an affected device. A successful exploit could allow the attacker to cause the web-based management interface to become unresponsive.
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-2026-20308
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.
No affected product recoded yet
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 | MEDIUM | [email protected] |
Solution
Apply software updates to systems experiencing denial of service due to insufficient input validation.
- Update Cisco IOS XE Software to a fixed version.
- Apply vendor-provided security patches.
- Validate all user inputs carefully.
- Monitor systems for unusual activity.
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-2026-20308.
| URL | Resource |
|---|---|
| https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webui-dos-qdc7qx3 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-20308 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-2026-20308
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-2026-20308 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-20308 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-2026-20308', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-05T17:34:35.714176Z'} -
New CVE Received by [email protected]
Aug. 05, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Cisco', 'product': 'Cisco IOS XE Software', 'versions': [{'status': 'affected', 'version': '17.2.1a'}, {'status': 'affected', 'version': '16.12.1y'}, {'status': 'affected', 'version': '16.12.3s'}, {'status': 'affected', 'version': '16.12.1w'}, {'status': 'affected', 'version': '16.9.1d'}, {'status': 'affected', 'version': '17.3.1'}, {'status': 'affected', 'version': '16.9.4c'}, {'status': 'affected', 'version': '17.2.1'}, {'status': 'affected', 'version': '16.9.1b'}, {'status': 'affected', 'version': '16.9.2s'}, {'status': 'affected', 'version': '16.12.4'}, {'status': 'affected', 'version': '16.12.3a'}, {'status': 'affected', 'version': '17.1.1s'}, {'status': 'affected', 'version': '16.11.1a'}, {'status': 'affected', 'version': '16.11.1b'}, {'status': 'affected', 'version': '16.9.1s'}, {'status': 'affected', 'version': '16.9.3h'}, {'status': 'affected', 'version': '16.9.1c'}, {'status': 'affected', 'version': '16.10.1f'}, {'status': 'affected', 'version': '17.2.1v'}, {'status': 'affected', 'version': '16.9.3a'}, {'status': 'affected', 'version': '16.12.1a'}, {'status': 'affected', 'version': '16.12.1x'}, {'status': 'affected', 'version': '16.10.1c'}, {'status': 'affected', 'version': '16.12.3'}, {'status': 'affected', 'version': '16.11.2'}, {'status': 'affected', 'version': '16.12.2s'}, {'status': 'affected', 'version': '16.10.1b'}, {'status': 'affected', 'version': '16.9.6'}, {'status': 'affected', 'version': '16.9.2'}, {'status': 'affected', 'version': '16.10.1'}, {'status': 'affected', 'version': '16.12.1t'}, {'status': 'affected', 'version': '16.9.1'}, {'status': 'affected', 'version': '16.9.3s'}, {'status': 'affected', 'version': '16.12.2'}, {'status': 'affected', 'version': '16.11.1'}, {'status': 'affected', 'version': '16.9.3'}, {'status': 'affected', 'version': '16.11.1s'}, {'status': 'affected', 'version': '16.12.1'}, {'status': 'affected', 'version': '17.1.1'}, {'status': 'affected', 'version': '17.1.2'}, {'status': 'affected', 'version': '16.10.1d'}, {'status': 'affected', 'version': '17.1.1t'}, {'status': 'affected', 'version': '16.9.4'}, {'status': 'affected', 'version': '16.12.2t'}, {'status': 'affected', 'version': '16.9.5'}, {'status': 'affected', 'version': '16.10.1e'}, {'status': 'affected', 'version': '16.10.1a'}, {'status': 'affected', 'version': '16.12.1z'}, {'status': 'affected', 'version': '16.9.1a'}, {'status': 'affected', 'version': '16.9.5f'}, {'status': 'affected', 'version': '16.10.1g'}, {'status': 'affected', 'version': '16.9.2a'}, {'status': 'affected', 'version': '16.10.3'}, {'status': 'affected', 'version': '16.11.1c'}, {'status': 'affected', 'version': '16.10.1s'}, {'status': 'affected', 'version': '17.2.1r'}, {'status': 'affected', 'version': '17.1.1a'}, {'status': 'affected', 'version': '16.10.2'}, {'status': 'affected', 'version': '16.12.2a'}, {'status': 'affected', 'version': '16.12.1c'}, {'status': 'affected', 'version': '16.12.1s'}, {'status': 'affected', 'version': '17.2.2'}, {'status': 'affected', 'version': '16.9.8'}, {'status': 'affected', 'version': '16.9.7'}, {'status': 'affected', 'version': '17.1.3'}, {'status': 'affected', 'version': '17.3.1a'}, {'status': 'affected', 'version': '17.3.2a'}, {'status': 'affected', 'version': '16.12.5'}, {'status': 'affected', 'version': '17.3.1w'}, {'status': 'affected', 'version': '17.3.2'}, {'status': 'affected', 'version': '17.4.1'}, {'status': 'affected', 'version': '16.12.4a'}, {'status': 'affected', 'version': '17.4.1a'}, {'status': 'affected', 'version': '17.3.1x'}, {'status': 'affected', 'version': '17.3.3'}, {'status': 'affected', 'version': '17.2.3'}, {'status': 'affected', 'version': '17.5.1'}, {'status': 'affected', 'version': '16.12.1z1'}, {'status': 'affected', 'version': '16.12.5a'}, {'status': 'affected', 'version': '17.4.1b'}, {'status': 'affected', 'version': '17.3.1z'}, {'status': 'affected', 'version': '16.12.5b'}, {'status': 'affected', 'version': '17.4.2'}, {'status': 'affected', 'version': '17.3.3a'}, {'status': 'affected', 'version': '17.3.5'}, {'status': 'affected', 'version': '17.3.4'}, {'status': 'affected', 'version': '17.5.1a'}, {'status': 'affected', 'version': '16.12.6'}, {'status': 'affected', 'version': '17.6.1'}, {'status': 'affected', 'version': '16.12.1z2'}, {'status': 'affected', 'version': '17.3.4a'}, {'status': 'affected', 'version': '17.6.1a'}, {'status': 'affected', 'version': '17.7.1'}, {'status': 'affected', 'version': '17.6.1x'}, {'status': 'affected', 'version': '17.6.2'}, {'status': 'affected', 'version': '16.12.6a'}, {'status': 'affected', 'version': '17.3.4c'}, {'status': 'affected', 'version': '17.4.2a'}, {'status': 'affected', 'version': '17.3.4b'}, {'status': 'affected', 'version': '17.7.1a'}, {'status': 'affected', 'version': '16.12.7'}, {'status': 'affected', 'version': '17.8.1a'}, {'status': 'affected', 'version': '17.6.3a'}, {'status': 'affected', 'version': '17.6.3'}, {'status': 'affected', 'version': '17.7.2'}, {'status': 'affected', 'version': '17.7.1b'}, {'status': 'affected', 'version': '17.9.1w'}, {'status': 'affected', 'version': '17.3.5a'}, {'status': 'affected', 'version': '17.6.1z'}, {'status': 'affected', 'version': '16.12.8'}, {'status': 'affected', 'version': '17.8.1'}, {'status': 'affected', 'version': '17.9.1'}, {'status': 'affected', 'version': '17.6.4'}, {'status': 'affected', 'version': '17.3.5b'}, {'status': 'affected', 'version': '17.9.1a'}, {'status': 'affected', 'version': '17.3.6'}, {'status': 'affected', 'version': '17.10.1'}, {'status': 'affected', 'version': '16.9.8a'}, {'status': 'affected', 'version': '17.6.1z1'}, {'status': 'affected', 'version': '17.10.1a'}, {'status': 'affected', 'version': '17.9.2'}, {'status': 'affected', 'version': '17.6.5'}, {'status': 'affected', 'version': '17.9.1x'}, {'status': 'affected', 'version': '17.9.1y'}, {'status': 'affected', 'version': '16.9.8b'}, {'status': 'affected', 'version': '17.3.7'}, {'status': 'affected', 'version': '17.9.2a'}, {'status': 'affected', 'version': '17.9.3'}, {'status': 'affected', 'version': '16.12.9'}, {'status': 'affected', 'version': '17.11.1'}, {'status': 'affected', 'version': '17.10.1b'}, {'status': 'affected', 'version': '17.6.6'}, {'status': 'affected', 'version': '17.9.1x1'}, {'status': 'affected', 'version': '17.11.1a'}, {'status': 'affected', 'version': '17.9.3a'}, {'status': 'affected', 'version': '17.12.1'}, {'status': 'affected', 'version': '17.3.8'}, {'status': 'affected', 'version': '17.9.4'}, {'status': 'affected', 'version': '16.12.10'}, {'status': 'affected', 'version': '17.12.1w'}, {'status': 'affected', 'version': '17.9.1y1'}, {'status': 'affected', 'version': '17.12.1a'}, {'status': 'affected', 'version': '17.9.5'}, {'status': 'affected', 'version': '17.13.1'}, {'status': 'affected', 'version': '17.12.1x'}, {'status': 'affected', 'version': '17.12.2'}, {'status': 'affected', 'version': '17.14.1'}, {'status': 'affected', 'version': '17.9.4a'}, {'status': 'affected', 'version': '17.3.8a'}, {'status': 'affected', 'version': '17.6.6a'}, {'status': 'affected', 'version': '17.6.5a'}, {'status': 'affected', 'version': '17.6.7'}, {'status': 'affected', 'version': '16.12.10a'}, {'status': 'affected', 'version': '17.15.1'}, {'status': 'affected', 'version': '17.13.1a'}, {'status': 'affected', 'version': '17.12.2a'}, {'status': 'affected', 'version': '16.12.11'}, {'status': 'affected', 'version': '17.12.3'}, {'status': 'affected', 'version': '17.12.1y'}, {'status': 'affected', 'version': '17.12.1z'}, {'status': 'affected', 'version': '17.9.5a'}, {'status': 'affected', 'version': '17.14.1a'}, {'status': 'affected', 'version': '17.9.5b'}, {'status': 'affected', 'version': '17.6.8'}, {'status': 'affected', 'version': '16.12.12'}, {'status': 'affected', 'version': '17.12.4'}, {'status': 'affected', 'version': '17.9.6'}, {'status': 'affected', 'version': '17.17.1'}, {'status': 'affected', 'version': '17.16.1'}, {'status': 'affected', 'version': '17.15.1w'}, {'status': 'affected', 'version': '17.12.3a'}, {'status': 'affected', 'version': '17.9.5c'}, {'status': 'affected', 'version': '17.15.1a'}, {'status': 'affected', 'version': '17.12.1z1'}, {'status': 'affected', 'version': '17.15.2'}, {'status': 'affected', 'version': '17.15.1b'}, {'status': 'affected', 'version': '17.9.5d'}, {'status': 'affected', 'version': '17.15.1x'}, {'status': 'affected', 'version': '17.9.6a'}, {'status': 'affected', 'version': '17.12.1z2'}, {'status': 'affected', 'version': '17.6.8a'}, {'status': 'affected', 'version': '17.16.1a'}, {'status': 'affected', 'version': '16.12.13'}, {'status': 'affected', 'version': '17.15.3'}, {'status': 'affected', 'version': '17.9.7'}, {'status': 'affected', 'version': '17.12.5'}, {'status': 'affected', 'version': '17.15.1y'}, {'status': 'affected', 'version': '17.9.5e'}, {'status': 'affected', 'version': '17.12.4a'}, {'status': 'affected', 'version': '17.15.2a'}, {'status': 'affected', 'version': '17.15.2c'}, {'status': 'affected', 'version': '17.15.2b'}, {'status': 'affected', 'version': '17.12.1z3'}, {'status': 'affected', 'version': '17.9.5f'}, {'status': 'affected', 'version': '17.12.4b'}, {'status': 'affected', 'version': '17.12.5a'}, {'status': 'affected', 'version': '17.18.1'}, {'status': 'affected', 'version': '17.12.6'}, {'status': 'affected', 'version': '17.12.1z4'}, {'status': 'affected', 'version': '17.9.8'}, {'status': 'affected', 'version': '17.9.7a'}, {'status': 'affected', 'version': '17.15.3a'}, {'status': 'affected', 'version': '17.15.4'}, {'status': 'affected', 'version': '17.12.5b'}, {'status': 'affected', 'version': '17.15.3b'}, {'status': 'affected', 'version': '16.12.14'}, {'status': 'affected', 'version': '17.18.1z'}, {'status': 'affected', 'version': '17.9.7b'}, {'status': 'affected', 'version': '17.12.5c'}, {'status': 'affected', 'version': '26.1.1'}, {'status': 'affected', 'version': '17.18.1a'}, {'status': 'affected', 'version': '17.15.4a'}, {'status': 'affected', 'version': '17.18.2'}, {'status': 'affected', 'version': '17.18.1w'}, {'status': 'affected', 'version': '17.15.4b'}, {'status': 'affected', 'version': '17.12.6a'}, {'status': 'affected', 'version': '17.12.7'}, {'status': 'affected', 'version': '17.15.4c'}, {'status': 'affected', 'version': '17.9.9'}, {'status': 'affected', 'version': '17.12.5d'}, {'status': 'affected', 'version': '16.12.15'}, {'status': 'affected', 'version': '17.15.4s1'}, {'status': 'affected', 'version': '17.15.5'}, {'status': 'affected', 'version': '17.12.1z5'}, {'status': 'affected', 'version': '17.18.1x'}, {'status': 'affected', 'version': '17.12.1z6'}, {'status': 'affected', 'version': '17.15.4d'}, {'status': 'affected', 'version': '17.12.6b'}, {'status': 'affected', 'version': '17.4.1c'}, {'status': 'affected', 'version': '17.15.5a'}, {'status': 'affected', 'version': '17.18.1y'}, {'status': 'affected', 'version': '17.12.7a'}, {'status': 'affected', 'version': '17.18.3'}, {'status': 'affected', 'version': '17.12.7b'}, {'status': 'affected', 'version': '17.18.3a'}, {'status': 'affected', 'version': '26.1.1a'}, {'status': 'affected', 'version': '26.2.1ea'}, {'status': 'affected', 'version': '16.12.16'}], 'defaultStatus': 'unknown'}] Added Description A vulnerability in the web-based management interface of Cisco IOS XE Software could allow an authenticated, remote attacker with low privileges to perform a denial of service (DoS) attack against an affected device. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending crafted input to the web-based management interface of an affected device. A successful exploit could allow the attacker to cause the web-based management interface to become unresponsive. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L Added CWE CWE-269 Added Reference https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webui-dos-qdc7qx3
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.