Device reload via malformed L2TP packet handling
Published Sep 27, 2023 · Updated Aug 2, 2024
Denial of service in Cisco IOS XE Software's L2TP feature allows remote attackers to force an affected device to reload. The feature improperly handles crafted L2TP packets sent directly to the device, causing an unexpected reload rather than safely rejecting the traffic. Exploitation requires a vulnerable release on a listed software-based Cisco Packet Processor platform with L2TP enabled and at least one active tunnel; no authentication is required, and the resulting reboot interrupts service.
Summary
What happened
Denial of service in Cisco IOS XE Software's L2TP feature allows remote attackers to force an affected device to reload. The feature improperly handles crafted L2TP packets sent directly to the device, causing an unexpected reload rather than safely rejecting the traffic. Exploitation requires a vulnerable release on a listed software-based Cisco Packet Processor platform with L2TP enabled and at least one active tunnel; no authentication is required, and the resulting reboot interrupts service.
The record
- CVE
- CVE-2023-20227
- Published
- Sep 27, 2023
- Updated
- Aug 2, 2024
- Vendor
- ClamAV
- Product
- Cisco IOS XE Software
- Classifications
- CWE-388, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 27, 2023CVE publishedPublication date reported by the CVE source.
- Aug 2, 2024Record 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=16.10.1
- Affected versionversion=16.10.1a
- Affected versionversion=16.10.1b
- Affected versionversion=16.10.1c
- Affected versionversion=16.10.1d
- Affected versionversion=16.10.1e
- Affected versionversion=16.10.1f
- Affected versionversion=16.10.1g
- Affected versionversion=16.10.1s
- Affected versionversion=16.10.2
- Affected versionversion=16.10.3
- Affected versionversion=16.11.1
- Affected versionversion=16.11.1a
- Affected versionversion=16.11.1b
- Affected versionversion=16.11.1s
- Affected versionversion=16.11.2
- Affected versionversion=16.12.1
- Affected versionversion=16.12.10a
- Affected versionversion=16.12.1a
- Affected versionversion=16.12.1c
- Affected versionversion=16.12.1s
- Affected versionversion=16.12.1t
- Affected versionversion=16.12.1w
- Affected versionversion=16.12.1x
- Affected versionversion=16.12.1y
- Affected versionversion=16.12.1z1
- Affected versionversion=16.12.1z2
- Affected versionversion=16.12.2
- Affected versionversion=16.12.2a
- Affected versionversion=16.12.2s
- Affected versionversion=16.12.3
- Affected versionversion=16.12.3s
- Affected versionversion=16.12.4
- Affected versionversion=16.12.4a
- Affected versionversion=16.12.5
- Affected versionversion=16.12.5a
- Affected versionversion=16.12.6
- Affected versionversion=16.12.6a
- Affected versionversion=16.12.7
- Affected versionversion=16.12.8
- Affected versionversion=16.8.1
- Affected versionversion=16.8.1a
- Affected versionversion=16.8.1b
- Affected versionversion=16.8.1c
- Affected versionversion=16.8.1d
- Affected versionversion=16.8.1e
- Affected versionversion=16.8.1s
- Affected versionversion=16.8.2
- Affected versionversion=16.8.3
- Affected versionversion=16.9.1
- Affected versionversion=16.9.1a
- Affected versionversion=16.9.1b
- Affected versionversion=16.9.1s
- Affected versionversion=16.9.2
- Affected versionversion=16.9.3
- Affected versionversion=16.9.4
- Affected versionversion=16.9.5
- Affected versionversion=16.9.5f
- Affected versionversion=16.9.6
- Affected versionversion=16.9.7
- Affected versionversion=16.9.8
- Affected versionversion=17.1.1
- Affected versionversion=17.1.1a
- Affected versionversion=17.1.1s
- Affected versionversion=17.1.1t
- Affected versionversion=17.1.3
- Affected versionversion=17.2.1
- Affected versionversion=17.2.1a
- Affected versionversion=17.2.1r
- Affected versionversion=17.2.1v
- Affected versionversion=17.2.2
- Affected versionversion=17.2.3
- Affected versionversion=17.3.1
- Affected versionversion=17.3.1a
- Affected versionversion=17.3.1w
- Affected versionversion=17.3.1x
- Affected versionversion=17.3.1z
- Affected versionversion=17.3.2
- Affected versionversion=17.3.2a
- Affected versionversion=17.3.3
- Affected versionversion=17.3.4
- Affected versionversion=17.3.4a
- Affected versionversion=17.3.4c
- Affected versionversion=17.3.5
- Affected versionversion=17.3.5a
- Affected versionversion=17.3.5b
- Affected versionversion=17.3.6
- Affected versionversion=17.3.7
- Affected versionversion=17.4.1
- Affected versionversion=17.4.1a
- Affected versionversion=17.4.1b
- Affected versionversion=17.4.2
- Affected versionversion=17.4.2a
- Affected versionversion=17.5.1
- Affected versionversion=17.5.1a
- Affected versionversion=17.5.1b
- Affected versionversion=17.5.1c
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.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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