PT-2026-27799 · Cisco · Cisco Ios Xe+1

Published 2026-03-25 · Updated 2026-03-30 · CVE-2026-20125

Positive Technologies (AI Summary)

CVSS v3.1

7.7

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Cisco IOS Software and Cisco IOS XE Software Release 3E

Description A flaw exists in the HTTP Server feature that could allow a remote attacker with valid user credentials to cause an unexpected device reload, leading to a denial of service (DoS) condition. This is due to insufficient validation of user-provided input. An attacker can exploit this by sending crafted HTTP requests to the affected device. A successful exploit causes a watchdog timer to expire, triggering a device reload and resulting in a DoS. The attacker requires a valid user account to exploit this issue.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Weakness Enumeration

CWE-228

Related Identifiers

BDU:2026-06473

CVE-2026-20125

Affected Products

Cisco Ios

Cisco Ios Xe

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-20125 · Security Note
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-http-dos-sbv8XRpL · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-06473 · Security Note
• https://twitter.com/EdgeDetectOps/status/2037182983728144496 · Twitter Post
• https://twitter.com/CVEnew/status/2038618155812110796 · Twitter Post