CiscoCVE-2026-20311
Cisco IOS XE Software: denial of service
Medium6.3CVE-2026-20311 · Published Aug 5, 2026 · updated Aug 6, 2026
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.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Cisco IOS XE Software Product | <= 17.3.1 | No fix yet |
| <= 17.3.1a | No fix yet | |
| <= 17.3.2a | No fix yet | |
| <= 17.3.1w | No fix yet |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-126
More Cisco advisories
All Cisco| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Aug 5 | Cisco Catalyst SD-WAN: cleartext secrets | High8.8 | No fix yet |
| Aug 5 | Cisco Catalyst SD-WAN: improper quantity validation | High7.7 | No fix yet |
| Aug 5 | Cisco IOS XE Software: denial of service | Medium4.3 | No fix yet |
| Aug 5 | Cisco Catalyst SD-WAN: link following | Critical9.1 | No fix yet |
| Aug 5 | Cisco IOS XE Software: denial of service | High8.6 | No fix yet |
| Aug 5 | Cisco Catalyst SD-WAN: improper input validation | Critical9.9 | No fix yet |