CVE record · CVE-2026-20125

Cisco IOS: A vulnerability in the HTTP Server feature of Cisco IOS Software and Cisco IOS XE…

CVSS 7.7 HighEPSS 0.0029 · 21st percentile

Published by the CVE Program (CNA: cisco) at 25 Mar 2026, 16:04 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Cisco	IOS	affected 12.2(33)CY affected 12.2(33)CY1 affected 12.2(33)CY2 affected 12.2(55)SE affected 12.2(55)SE3 affected 12.2(55)SE2 affected 12.2(58)SE affected 12.2(55)SE1 affected 12.2(58)SE1 affected 12.2(55)SE4 affected 12.2(58)SE2 affected 12.2(55)SE5 and 931 more
Cisco	Cisco IOS XE Software	affected 3.5.0E affected 3.5.1E affected 3.5.2E affected 3.5.3E affected 3.11.1S affected 3.11.2S affected 3.11.0S affected 3.11.3S affected 3.11.4S affected 3.12.0S affected 3.12.1S affected 3.12.2S and 145 more

Identifiers: CVE-2026-20125
CNA: cisco
Weakness (CWE): CWE-228
Tags: Cisco IOS
Cisco IOS XE Software
CWE-228
Published: 25 Mar 2026
Updated: 25 Mar 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.7	High	3.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H	CNA (cisco)

CISA KEV Not listed.
EPSS 0.0029, the 21st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 25 Mar 2026. New records show when each source confirmed them.

Sources

References from the CNA

sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-http-dos-sbv8XRpL

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.