Root code execution via HTTP heap overflow
Published Sep 25, 2025 · Updated Sep 25, 2025
Heap buffer overflow in Cisco ASA, FTD, IOS, IOS XE, and IOS XR web services allows remote attackers to execute code as root. A targeted service improperly validates crafted HTTP request data, causing a heap overwrite; exploitation also needs system details or mitigation bypasses. ASA and FTD require an enabled SSL-facing feature; IOS and IOS XE require enabled remote-access SSL VPN, while 32-bit IOS XR requires an ASR 9001 HTTP server.
Summary
What happened
Heap buffer overflow in Cisco ASA, FTD, IOS, IOS XE, and IOS XR web services allows remote attackers to execute code as root. A targeted service improperly validates crafted HTTP request data, causing a heap overwrite; exploitation also needs system details or mitigation bypasses. ASA and FTD require an enabled SSL-facing feature; IOS and IOS XE require enabled remote-access SSL VPN, while 32-bit IOS XR requires an ASR 9001 HTTP server.
The record
- CVE
- CVE-2025-20363
- Published
- Sep 25, 2025
- Updated
- Sep 25, 2025
- Vendor
- ClamAV
- Product
- Cisco Adaptive Security Appliance (ASA) Software
- Classifications
- CWE-122, T1190, T1068
- Attack vector
- network
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 25, 2025CVE publishedPublication date reported by the CVE source.
- Sep 25, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=9.12.1
- Affected versionversion=9.12.1.2
- Affected versionversion=9.12.1.3
- Affected versionversion=9.12.2
- Affected versionversion=9.12.2.1
- Affected versionversion=9.12.2.4
- Affected versionversion=9.12.2.5
- Affected versionversion=9.12.2.9
- Affected versionversion=9.12.3
- Affected versionversion=9.12.3.12
- Affected versionversion=9.12.3.2
- Affected versionversion=9.12.3.7
- Affected versionversion=9.12.3.9
- Affected versionversion=9.12.4
- Affected versionversion=9.12.4.10
- Affected versionversion=9.12.4.13
- Affected versionversion=9.12.4.18
- Affected versionversion=9.12.4.2
- Affected versionversion=9.12.4.24
- Affected versionversion=9.12.4.26
- Affected versionversion=9.12.4.29
- Affected versionversion=9.12.4.30
- Affected versionversion=9.12.4.35
- Affected versionversion=9.12.4.37
- Affected versionversion=9.12.4.38
- Affected versionversion=9.12.4.39
- Affected versionversion=9.12.4.4
- Affected versionversion=9.12.4.40
- Affected versionversion=9.12.4.41
- Affected versionversion=9.12.4.47
- Affected versionversion=9.12.4.48
- Affected versionversion=9.12.4.50
- Affected versionversion=9.12.4.52
- Affected versionversion=9.12.4.54
- Affected versionversion=9.12.4.55
- Affected versionversion=9.12.4.56
- Affected versionversion=9.12.4.58
- Affected versionversion=9.12.4.62
- Affected versionversion=9.12.4.65
- Affected versionversion=9.12.4.67
- Affected versionversion=9.12.4.7
- Affected versionversion=9.12.4.8
- Affected versionversion=9.14.1
- Affected versionversion=9.14.1.10
- Affected versionversion=9.14.1.15
- Affected versionversion=9.14.1.19
- Affected versionversion=9.14.1.30
- Affected versionversion=9.14.1.6
- Affected versionversion=9.14.2
- Affected versionversion=9.14.2.13
- Affected versionversion=9.14.2.15
- Affected versionversion=9.14.2.4
- Affected versionversion=9.14.2.8
- Affected versionversion=9.14.3
- Affected versionversion=9.14.3.1
- Affected versionversion=9.14.3.11
- Affected versionversion=9.14.3.13
- Affected versionversion=9.14.3.15
- Affected versionversion=9.14.3.18
- Affected versionversion=9.14.3.9
- Affected versionversion=9.14.4
- Affected versionversion=9.14.4.12
- Affected versionversion=9.14.4.13
- Affected versionversion=9.14.4.14
- Affected versionversion=9.14.4.15
- Affected versionversion=9.14.4.17
- Affected versionversion=9.14.4.22
- Affected versionversion=9.14.4.23
- Affected versionversion=9.14.4.24
- Affected versionversion=9.14.4.6
- Affected versionversion=9.14.4.7
- Affected versionversion=9.16.1
- Affected versionversion=9.16.1.28
- Affected versionversion=9.16.2
- Affected versionversion=9.16.2.11
- Affected versionversion=9.16.2.13
- Affected versionversion=9.16.2.14
- Affected versionversion=9.16.2.3
- Affected versionversion=9.16.2.7
- Affected versionversion=9.16.3
- Affected versionversion=9.16.3.14
- Affected versionversion=9.16.3.15
- Affected versionversion=9.16.3.19
- Affected versionversion=9.16.3.23
- Affected versionversion=9.16.3.3
- Affected versionversion=9.16.4
- Affected versionversion=9.16.4.14
- Affected versionversion=9.16.4.18
- Affected versionversion=9.16.4.19
- Affected versionversion=9.16.4.27
- Affected versionversion=9.16.4.38
- Affected versionversion=9.16.4.39
- Affected versionversion=9.16.4.42
- Affected versionversion=9.16.4.48
- Affected versionversion=9.16.4.55
- Affected versionversion=9.16.4.57
- Affected versionversion=9.16.4.61
- Affected versionversion=9.16.4.62
- Affected versionversion=9.16.4.67
- Affected versionversion=9.16.4.70
- Affected versionversion=9.16.4.71
- Affected versionversion=9.16.4.76
- Affected versionversion=9.16.4.82
- Affected versionversion=9.16.4.9
- Affected versionversion=9.17.1
- Affected versionversion=9.17.1.10
- Affected versionversion=9.17.1.11
- Affected versionversion=9.17.1.13
- Affected versionversion=9.17.1.15
- Affected versionversion=9.17.1.20
- Affected versionversion=9.17.1.30
- Affected versionversion=9.17.1.33
- Affected versionversion=9.17.1.39
- Affected versionversion=9.17.1.45
- Affected versionversion=9.17.1.46
- Affected versionversion=9.17.1.7
- Affected versionversion=9.17.1.9
- Affected versionversion=9.18.1
- Affected versionversion=9.18.1.3
- Affected versionversion=9.18.2
- Affected versionversion=9.18.2.5
- Affected versionversion=9.18.2.7
- Affected versionversion=9.18.2.8
- Affected versionversion=9.18.3
- Affected versionversion=9.18.3.39
- Affected versionversion=9.18.3.46
- Affected versionversion=9.18.3.53
- Affected versionversion=9.18.3.55
- Affected versionversion=9.18.3.56
- Affected versionversion=9.18.4
- Affected versionversion=9.18.4.22
- Affected versionversion=9.18.4.24
- Affected versionversion=9.18.4.29
- Affected versionversion=9.18.4.34
- Affected versionversion=9.18.4.40
- Affected versionversion=9.18.4.47
- Affected versionversion=9.18.4.5
- Affected versionversion=9.18.4.50
- Affected versionversion=9.18.4.52
- Affected versionversion=9.18.4.53
- Affected versionversion=9.18.4.8
- Affected versionversion=9.19.1
- Affected versionversion=9.19.1.12
- Affected versionversion=9.19.1.18
- Affected versionversion=9.19.1.22
- Affected versionversion=9.19.1.24
- Affected versionversion=9.19.1.27
- Affected versionversion=9.19.1.28
- Affected versionversion=9.19.1.31
- Affected versionversion=9.19.1.37
- Affected versionversion=9.19.1.38
- Affected versionversion=9.19.1.5
- Affected versionversion=9.19.1.9
- Affected versionversion=9.20.1
- Affected versionversion=9.20.1.5
- Affected versionversion=9.20.2
- Affected versionversion=9.20.2.10
- Affected versionversion=9.20.2.21
- Affected versionversion=9.20.2.22
- Affected versionversion=9.20.3
- Affected versionversion=9.20.3.10
- Affected versionversion=9.20.3.13
- Affected versionversion=9.20.3.4
- Affected versionversion=9.20.3.7
- Affected versionversion=9.20.3.9
- Affected versionversion=9.22.1.1
- Affected versionversion=9.22.1.2
- Affected versionversion=9.22.1.3
- Affected versionversion=9.22.1.6
- Affected versionversion=9.23.1
- Affected versionversion=9.8.1
- Affected versionversion=9.8.1.5
- Affected versionversion=9.8.1.7
- Affected versionversion=9.8.2
- Affected versionversion=9.8.2.14
- Affected versionversion=9.8.2.15
- Affected versionversion=9.8.2.17
- Affected versionversion=9.8.2.20
- Affected versionversion=9.8.2.24
- Affected versionversion=9.8.2.26
- Affected versionversion=9.8.2.28
- Affected versionversion=9.8.2.33
- Affected versionversion=9.8.2.35
- Affected versionversion=9.8.2.38
- Affected versionversion=9.8.2.45
- Affected versionversion=9.8.2.8
- Affected versionversion=9.8.3
- Affected versionversion=9.8.3.11
- Affected versionversion=9.8.3.14
- Affected versionversion=9.8.3.16
- Affected versionversion=9.8.3.18
- Affected versionversion=9.8.3.21
- Affected versionversion=9.8.3.26
- Affected versionversion=9.8.3.29
- Affected versionversion=9.8.3.8
- Affected versionversion=9.8.4
- Affected versionversion=9.8.4.10
- Affected versionversion=9.8.4.12
- Affected versionversion=9.8.4.15
- Affected versionversion=9.8.4.17
- Affected versionversion=9.8.4.20
- Affected versionversion=9.8.4.22
- Affected versionversion=9.8.4.25
- Affected versionversion=9.8.4.26
- Affected versionversion=9.8.4.29
- Affected versionversion=9.8.4.3
- Affected versionversion=9.8.4.32
- Affected versionversion=9.8.4.33
- Affected versionversion=9.8.4.34
- Affected versionversion=9.8.4.35
- Affected versionversion=9.8.4.39
- Affected versionversion=9.8.4.40
- Affected versionversion=9.8.4.41
- Affected versionversion=9.8.4.43
- Affected versionversion=9.8.4.44
- Affected versionversion=9.8.4.45
- Affected versionversion=9.8.4.46
- Affected versionversion=9.8.4.48
- Affected versionversion=9.8.4.7
- Affected versionversion=9.8.4.8
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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