8.6

CVE-2025-20222: cisco cisco firepower threat defense software Classic Buffer Overflow

CVSS: 8.6v3.1HighDeferred
Published 14-08-2025Last modified 14-08-2025
Open JSON

Vulnerability summary

CVE-2025-20222 is a high (CVSS 8.6) Classic Buffer Overflow vulnerability in cisco cisco firepower threat defense software. EPSS estimates a 0.64% chance of exploitation in the next 30 days, higher than 49.5% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.6/10
010
High · v3.1 (CVE.org)
EPSS score
0.64%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 14-08-2025
    PublishedVulnerability first disclosed.
  2. 14-08-2025
    Last modifiedVulnerability information updated.

Description

A vulnerability in the RADIUS proxy feature for the IPsec VPN feature of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. This vulnerability is due to improper processing of IPv6 packets. An attacker could exploit this vulnerability by sending IPv6 packets over an IPsec VPN connection to an affected device. A successful exploit could allow the attacker to trigger a reload of the device, resulting in a DoS condition.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.64%

Chance of exploitation in the next 30 days

Percentile

50%

Versus all other CVEs

30-day change

+0.03 pp

From 0.61% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.64%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Cisco1 product
  • cisco firepower threat defense software6.2.3 | 6.2.3.9 | 6.2.3.1 | 6.2.3.2 | 6.2.3.10 | 6.4.0 | 6.4.0.3 | 6.4.0.4 | 6.2.3.15 | 6.2.3.6 | 6.2.3.7 | 6.2.3.12 | 6.2.3.3 | 6.2.3.11 | 6.4.0.6 | 6.2.3.13 | 6.2.3.8 | 6.2.3.4 | 6.4.0.1 | 6.2.3.5 | 6.4.0.5 | 6.2.3.14 | 6.4.0.2 | 6.4.0.8 | 6.4.0.7 | 6.6.0 | 6.4.0.9 | 6.2.3.16 | 6.6.0.1 | 6.6.1 | 6.4.0.10 | 6.4.0.11 | 6.6.3 | 6.6.4 | 6.4.0.12 | 7.0.0 | 6.2.3.17 | 7.0.0.1 | 6.6.5 | 7.0.1 | 7.1.0 | 6.4.0.13 | 6.6.5.1 | 6.2.3.18 | 7.0.1.1 | 6.4.0.14 | 7.1.0.1 | 6.6.5.2 | 7.0.2 | 6.4.0.15 | 7.2.0 | 7.0.2.1 | 7.0.3 | 6.6.7 | 7.2.0.1 | 7.0.4 | 7.2.1 | 7.0.5 | 6.4.0.16 | 7.3.0 | 7.2.2 | 6.6.7.1 | 7.2.3 | 7.3.1 | 7.1.0.3 | 7.2.4 | 7.0.6 | 7.2.5 | 7.2.4.1 | 7.3.1.1 | 6.4.0.17 | 7.0.6.1 | 7.2.5.1 | 7.4.1 | 7.2.6 | 7.0.6.2 | 7.4.1.1 | 6.6.7.2 | 6.4.0.18 | 7.2.7 | 7.2.5.2 | 7.3.1.2 | 7.2.8 | 7.4.2 | 7.2.8.1 | 7.0.6.3 | 7.4.2.1 | 7.2.9

1 vendor · 1 product

References

1 links