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TI-2026-16497 Aliases CVE-2026-20311GHSA-7wh7-mfpx-74m2

Cisco IOS XE Software Web UI Denial of Service Vulnerability

Priority LOW 28CWE-126Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-126 and the CVSS impact.

Summary

A vulnerability in the web-based management interface of Cisco IOS XE Software could allow an authenticated, remote attacker with low privileges to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient error handling in the web-based management interface. An attacker could exploit this vulnerability by authenticating with a malformed certificate. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00252 16th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CiscoCisco IOS XE Software17.3.1; 17.3.1a; 17.3.2a; 17.3.1w; 17.3.2; 17.4.1; 17.4.1a; 17.3.1x; 17.3.3; 17.5.1; 17.4.1b; 17.3.1z; 17.4.2; 17.3.3a; 17.3.5; 17.3.4; 17.5.1a; 17.6.1; 17.3.4a; 17.6.1a; 17.7.1; 17.6.1x; 17.6.2; 17.3.4c; 17.4.2a; 17.3.4b; 17.7.1a; 17.8.1a; 17.6.3a; 17.6.3; 17.7.2; 17.7.1b; 17.9.1w; 17.3.5a; 17.6.1z; 17.8.1; 17.9.1; 17.6.4; 17.3.5b; 17.9.1a; 17.3.6; 17.10.1; 17.6.1z1; 17.10.1a; 17.9.2; 17.6.5; 17.9.1x; 17.9.1y; 17.3.7; 17.9.2a; 17.9.3; 17.11.1; 17.10.1b; 17.6.6; 17.9.1x1; 17.11.1a; 17.9.3a; 17.12.1; 17.3.8; 17.9.4; 17.12.1w; 17.9.1y1; 17.12.1a; 17.9.5; 17.13.1; 17.12.1x; 17.12.2; 17.14.1; 17.9.4a; 17.3.8a; 17.6.6a; 17.6.5a; 17.6.7; 17.15.1; 17.13.1a; 17.12.2a; 17.12.3; 17.12.1y; 17.12.1z; 17.9.5a; 17.14.1a; 17.9.5b; 17.6.8; 17.12.4; 17.9.6; 17.17.1; 17.16.1; 17.15.1w; 17.12.3a; 17.9.5c; 17.15.1a; 17.12.1z1; 17.15.2; 17.15.1b; 17.9.5d; 17.15.1x; 17.9.6a; 17.12.1z2; 17.6.8a; 17.16.1a; 17.15.3; 17.9.7; 17.12.5; 17.15.1y; 17.9.5e; 17.12.4a; 17.15.2a; 17.15.2c; 17.15.2b; 17.12.1z3; 17.9.5f; 17.12.4b; 17.12.5a; 17.18.1; 17.12.6; 17.12.1z4; 17.9.8; 17.9.7a; 17.15.3a; 17.15.4; 17.12.5b; 17.15.3b; 17.18.1z; 17.9.7b; 17.12.5c; 26.1.1; 17.18.1a; 17.15.4a; 17.18.2; 17.18.1w; 17.15.4b; 17.12.6a; 17.12.7; 17.15.4c; 17.9.9; 17.12.5d; 17.15.4s1; 17.15.5; 17.12.1z5; 17.18.1x; 17.12.1z6; 17.15.4d; 17.12.6b; 17.4.1c; 17.15.5a; 17.18.1y; 17.12.7a; 17.18.3; 17.12.7b; 17.18.3a; 26.1.1a; 26.2.1ea—No fix listedCNA
  • Cisco IOS XE Software VendorCisco Affected 17.3.1; 17.3.1a; 17.3.2a; 17.3.1w; 17.3.2; 17.4.1; 17.4.1a; 17.3.1x; 17.3.3; 17.5.1; 17.4.1b; 17.3.1z; 17.4.2; 17.3.3a; 17.3.5; 17.3.4; 17.5.1a; 17.6.1; 17.3.4a; 17.6.1a; 17.7.1; 17.6.1x; 17.6.2; 17.3.4c; 17.4.2a; 17.3.4b; 17.7.1a; 17.8.1a; 17.6.3a; 17.6.3; 17.7.2; 17.7.1b; 17.9.1w; 17.3.5a; 17.6.1z; 17.8.1; 17.9.1; 17.6.4; 17.3.5b; 17.9.1a; 17.3.6; 17.10.1; 17.6.1z1; 17.10.1a; 17.9.2; 17.6.5; 17.9.1x; 17.9.1y; 17.3.7; 17.9.2a; 17.9.3; 17.11.1; 17.10.1b; 17.6.6; 17.9.1x1; 17.11.1a; 17.9.3a; 17.12.1; 17.3.8; 17.9.4; 17.12.1w; 17.9.1y1; 17.12.1a; 17.9.5; 17.13.1; 17.12.1x; 17.12.2; 17.14.1; 17.9.4a; 17.3.8a; 17.6.6a; 17.6.5a; 17.6.7; 17.15.1; 17.13.1a; 17.12.2a; 17.12.3; 17.12.1y; 17.12.1z; 17.9.5a; 17.14.1a; 17.9.5b; 17.6.8; 17.12.4; 17.9.6; 17.17.1; 17.16.1; 17.15.1w; 17.12.3a; 17.9.5c; 17.15.1a; 17.12.1z1; 17.15.2; 17.15.1b; 17.9.5d; 17.15.1x; 17.9.6a; 17.12.1z2; 17.6.8a; 17.16.1a; 17.15.3; 17.9.7; 17.12.5; 17.15.1y; 17.9.5e; 17.12.4a; 17.15.2a; 17.15.2c; 17.15.2b; 17.12.1z3; 17.9.5f; 17.12.4b; 17.12.5a; 17.18.1; 17.12.6; 17.12.1z4; 17.9.8; 17.9.7a; 17.15.3a; 17.15.4; 17.12.5b; 17.15.3b; 17.18.1z; 17.9.7b; 17.12.5c; 26.1.1; 17.18.1a; 17.15.4a; 17.18.2; 17.18.1w; 17.15.4b; 17.12.6a; 17.12.7; 17.15.4c; 17.9.9; 17.12.5d; 17.15.4s1; 17.15.5; 17.12.1z5; 17.18.1x; 17.12.1z6; 17.15.4d; 17.12.6b; 17.4.1c; 17.15.5a; 17.18.1y; 17.12.7a; 17.18.3; 17.12.7b; 17.18.3a; 26.1.1a; 26.2.1ea Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*——Cisco
  • cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:* Versions — — ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-20311
  2. 2026-10-03 Alias added: GHSA-7wh7-mfpx-74m2

References

Other 1

  • TI-2026-74174 Arbitrary file write in Cisco Secure Email Gateway via AMP feature KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-53490 Cisco Catalyst SD-WAN Manager System Account Authorization Bypass Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-53489 Cisco Secure Email Gateway SQL Injection Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-53488 Cisco Identity Services Engine Authentication Bypass Vulnerability KEVCVSS 3.1CRITICAL 10.0
  • TI-2026-16388 Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability KEVCVSS 3.1CRITICAL 10.0
  • TI-2026-16344 Cisco Secure Firewall Management Center Software Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 10.0
See all 7059 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences