Unauthorized Access in Cisco IOS Software HTTP Server Feature
CVE-2026-20125

7.7HIGH

Key Information:

Vendor

Cisco
Status
iOS
Cisco iOS Xe Software
Vendor
CVE Published:
25 March 2026

Badges

👾 Exploit Exists

What is CVE-2026-20125?

A vulnerability exists in the HTTP Server feature of Cisco IOS Software and Cisco IOS XE Software that can allow an authenticated remote attacker to trigger a device reload. This issue arises from improper validation of user input, enabling an attacker to send malformed HTTP requests. If successfully exploited, this could cause a watchdog timer to expire and the device to reload, leading to a denial of service. It is important that organizations using the affected software implement necessary security measures as attackers require a valid user account to exploit this vulnerability.

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Affected Version(s)

Cisco IOS XE Software 3.5.0E

Cisco IOS XE Software 3.5.1E

Cisco IOS XE Software 3.5.2E

References

https://sec.cloudapps.cisco.com/security/center/content/C...

CVSS V3.1

Score:
7.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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