Cisco IOS XE Software Release 3E HTTP Server DoS (cisco-sa-ios-http-dos-sbv8XRpL)

high Nessus Plugin ID 305770

Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version, Cisco IOS-XE Software is affected by a vulnerability.

- A denial of service (DoS) vulnerability exists in Cisco IOS XE Software due to improper validation of user-supplied input. An authenticated remote attacker can exploit this issue, via sending malformed HTTP requests to an affected device, allowing the attacker to cause a watchdog timer to expire and the device to reload, resulting in a DoS condition. To exploit this vulnerability, the attacker must have a valid user account. (CVE-2026-20125)

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

Solution

Upgrade to the relevant fixed version referenced in Cisco bug ID CSCwq14981

Plugin Details

Severity: High

ID: 305770

File Name: cisco-sa-ios-http-dos-sbv8XRpL-iosxe.nasl

Version: 1.1

Type: Combined

Family: CISCO

Published: 4/9/2026

Updated: 4/9/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:C

CVSS Score Source: CVE-2026-20125

CVSS v3

Risk Factor: High

Base Score: 7.7

Temporal Score: 6.7

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:cisco:ios_xe

Required KB Items: Host/Cisco/IOS-XE/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 3/25/2026

Vulnerability Publication Date: 3/25/2026

Reference Information

CVE: CVE-2026-20125

CWE: 228

CISCO-SA: cisco-sa-ios-http-dos-sbv8XRpL

IAVA: 2026-A-0263

CISCO-BUG-ID: CSCwq14981

Detections

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