Buffer overflow in Cisco iOS Xe Software
CVE-2025-20149
A vulnerability in the CLI of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, local attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to a buffer overflow. An attacker with a low-privileged account could exploit this vulnerability by using crafted commands at the CLI prompt. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.001 (1.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 1.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: -0.000
Affected products
- Cisco iOS Xe Software — versions 3.7.0S, 3.7.1S, 3.7.2S
- Cisco iOS — versions 15.2(4)ec2, 15.0(2)ex8, 15.2(4)jb1
- Cisco iOS Xe — versions 16.1.1, 16.1.2, 16.1.3
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2025-20149?
- CVE-2025-20149 is a medium-severity vulnerability in Cisco iOS Xe Software, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.5/10. Published 2025-09-24.
- How severe is CVE-2025-20149?
- Medium severity. CVSS v3 base score is 6.5 out of 10.