Device reload via improper IPv6 packet processing
Published Aug 14, 2025 · Updated Aug 14, 2025
Denial of service in Cisco Secure FTD Software on Firepower 2100 firewalls allows remote attackers to force a device reload via IPv6 over IPsec. The RADIUS proxy path improperly processes IPv6 packets received through an IPsec VPN; Cisco does not disclose the affected function or buffer operation. Exposure requires Firepower 2100 hardware, enabled IKEv1 or IKEv2 and IPv6 on the receiving interface, plus a permissive control-plane ACL on FTD 7.0 and earlier.
Summary
What happened
Denial of service in Cisco Secure FTD Software on Firepower 2100 firewalls allows remote attackers to force a device reload via IPv6 over IPsec. The RADIUS proxy path improperly processes IPv6 packets received through an IPsec VPN; Cisco does not disclose the affected function or buffer operation. Exposure requires Firepower 2100 hardware, enabled IKEv1 or IKEv2 and IPv6 on the receiving interface, plus a permissive control-plane ACL on FTD 7.0 and earlier.
The record
- CVE
- CVE-2025-20222
- Published
- Aug 14, 2025
- Updated
- Aug 14, 2025
- Vendor
- ClamAV
- Product
- Cisco Firepower Threat Defense
- Classifications
- CWE-120, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 14, 2025CVE publishedPublication date reported by the CVE source.
- Aug 14, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.2.3
- Affected versionversion=6.2.3.1
- Affected versionversion=6.2.3.10
- Affected versionversion=6.2.3.11
- Affected versionversion=6.2.3.12
- Affected versionversion=6.2.3.13
- Affected versionversion=6.2.3.14
- Affected versionversion=6.2.3.15
- Affected versionversion=6.2.3.16
- Affected versionversion=6.2.3.17
- Affected versionversion=6.2.3.18
- Affected versionversion=6.2.3.2
- Affected versionversion=6.2.3.3
- Affected versionversion=6.2.3.4
- Affected versionversion=6.2.3.5
- Affected versionversion=6.2.3.6
- Affected versionversion=6.2.3.7
- Affected versionversion=6.2.3.8
- Affected versionversion=6.2.3.9
- Affected versionversion=6.4.0
- Affected versionversion=6.4.0.1
- Affected versionversion=6.4.0.10
- Affected versionversion=6.4.0.11
- Affected versionversion=6.4.0.12
- Affected versionversion=6.4.0.13
- Affected versionversion=6.4.0.14
- Affected versionversion=6.4.0.15
- Affected versionversion=6.4.0.16
- Affected versionversion=6.4.0.17
- Affected versionversion=6.4.0.18
- Affected versionversion=6.4.0.2
- Affected versionversion=6.4.0.3
- Affected versionversion=6.4.0.4
- Affected versionversion=6.4.0.5
- Affected versionversion=6.4.0.6
- Affected versionversion=6.4.0.7
- Affected versionversion=6.4.0.8
- Affected versionversion=6.4.0.9
- Affected versionversion=6.6.0
- Affected versionversion=6.6.0.1
- Affected versionversion=6.6.1
- Affected versionversion=6.6.3
- Affected versionversion=6.6.4
- Affected versionversion=6.6.5
- Affected versionversion=6.6.5.1
- Affected versionversion=6.6.5.2
- Affected versionversion=6.6.7
- Affected versionversion=6.6.7.1
- Affected versionversion=6.6.7.2
- Affected versionversion=7.0.0
- Affected versionversion=7.0.0.1
- Affected versionversion=7.0.1
- Affected versionversion=7.0.1.1
- Affected versionversion=7.0.2
- Affected versionversion=7.0.2.1
- Affected versionversion=7.0.3
- Affected versionversion=7.0.4
- Affected versionversion=7.0.5
- Affected versionversion=7.0.6
- Affected versionversion=7.0.6.1
- Affected versionversion=7.0.6.2
- Affected versionversion=7.0.6.3
- Affected versionversion=7.1.0
- Affected versionversion=7.1.0.1
- Affected versionversion=7.1.0.3
- Affected versionversion=7.2.0
- Affected versionversion=7.2.0.1
- Affected versionversion=7.2.1
- Affected versionversion=7.2.2
- Affected versionversion=7.2.3
- Affected versionversion=7.2.4
- Affected versionversion=7.2.4.1
- Affected versionversion=7.2.5
- Affected versionversion=7.2.5.1
- Affected versionversion=7.2.5.2
- Affected versionversion=7.2.6
- Affected versionversion=7.2.7
- Affected versionversion=7.2.8
- Affected versionversion=7.2.8.1
- Affected versionversion=7.2.9
- Affected versionversion=7.3.0
- Affected versionversion=7.3.1
- Affected versionversion=7.3.1.1
- Affected versionversion=7.3.1.2
- Affected versionversion=7.4.1
- Affected versionversion=7.4.1.1
- Affected versionversion=7.4.2
- Affected versionversion=7.4.2.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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