Vulnerability in Cisco iOS Xe Software
CVE-2026-20125
A vulnerability in the HTTP Server feature of Cisco IOS Software and Cisco IOS XE Software Release 3E could allow an authenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to improper validation of user-supplied input. An attacker could exploit this vulnerability by sending malformed HTTP requests to an affected device. A successful exploit could allow 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.003 (19.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Cisco iOS Xe Software — versions 3.5.0E, 3.5.1E, 3.5.2E
- Cisco iOS — versions 12.2(33)CY, 12.2(33)CY1, 12.2(33)CY2
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-20125?
- CVE-2026-20125 is a high-severity vulnerability in Cisco iOS Xe Software, classified under CWE-228. CVSS score: 7.7/10. Published 2026-03-25.
- How severe is CVE-2026-20125?
- High severity. CVSS v3 base score is 7.7 out of 10.