Vulnerability in Cisco iOS

CVE-2025-20327

A vulnerability in the web UI of Cisco IOS 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 improper input validation. An attacker could exploit this vulnerability by sending a crafted URL in an HTTP request. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.

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: 0.004 (30.3th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-20327: held from 0.004 to 0.004.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

  • Cisco iOS — versions 15.2(7)E6, 15.2(7)e2, 15.2(8)e1

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2025-20327?
CVE-2025-20327 is a high-severity vulnerability in Cisco iOS, classified under CWE-1287. CVSS score: 7.7/10. Published 2025-09-24.
How severe is CVE-2025-20327?
High severity. CVSS v3 base score is 7.7 out of 10.