Unauthenticated dhcpd crash via malformed DHCPv4 messages
Published Mar 13, 2024 · Updated Aug 14, 2024
Denial of service in Cisco IOS XR Software allows remote attackers to crash the dhcpd process with a malformed DHCPv4 message. The DHCPv4 server and proxy message-processing path improperly validates certain messages and dereferences a null pointer, terminating dhcpd. Exposure requires an enabled DHCPv4 server or proxy profile; the process restarts automatically in about two minutes, and the router does not reload.
Summary
What happened
Denial of service in Cisco IOS XR Software allows remote attackers to crash the dhcpd process with a malformed DHCPv4 message. The DHCPv4 server and proxy message-processing path improperly validates certain messages and dereferences a null pointer, terminating dhcpd. Exposure requires an enabled DHCPv4 server or proxy profile; the process restarts automatically in about two minutes, and the router does not reload.
The record
- CVE
- CVE-2024-20266
- Published
- Mar 13, 2024
- Updated
- Aug 14, 2024
- Vendor
- ClamAV
- Product
- Cisco IOS XR Software
- Classifications
- CWE-476, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 13, 2024CVE publishedPublication date reported by the CVE source.
- Aug 14, 2024Record 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=5.2.0
- Affected versionversion=5.2.1
- Affected versionversion=5.2.2
- Affected versionversion=5.2.3
- Affected versionversion=5.2.4
- Affected versionversion=5.2.47
- Affected versionversion=5.2.5
- Affected versionversion=5.3.0
- Affected versionversion=5.3.1
- Affected versionversion=5.3.2
- Affected versionversion=5.3.3
- Affected versionversion=5.3.4
- Affected versionversion=6.0.0
- Affected versionversion=6.0.1
- Affected versionversion=6.0.2
- Affected versionversion=6.1.1
- Affected versionversion=6.1.12
- Affected versionversion=6.1.2
- Affected versionversion=6.1.22
- Affected versionversion=6.1.3
- Affected versionversion=6.1.32
- Affected versionversion=6.1.36
- Affected versionversion=6.1.4
- Affected versionversion=6.1.42
- Affected versionversion=6.2.1
- Affected versionversion=6.2.11
- Affected versionversion=6.2.2
- Affected versionversion=6.2.25
- Affected versionversion=6.2.3
- Affected versionversion=6.3.15
- Affected versionversion=6.3.2
- Affected versionversion=6.3.3
- Affected versionversion=6.4.1
- Affected versionversion=6.4.2
- Affected versionversion=6.4.3
- Affected versionversion=6.5.1
- Affected versionversion=6.5.2
- Affected versionversion=6.5.25
- Affected versionversion=6.5.26
- Affected versionversion=6.5.28
- Affected versionversion=6.5.29
- Affected versionversion=6.5.3
- Affected versionversion=6.5.32
- Affected versionversion=6.5.33
- Affected versionversion=6.6.2
- Affected versionversion=6.6.25
- Affected versionversion=6.6.3
- Affected versionversion=6.6.4
- Affected versionversion=6.7.1
- Affected versionversion=6.7.2
- Affected versionversion=6.7.3
- Affected versionversion=6.7.4
- Affected versionversion=6.8.1
- Affected versionversion=6.8.2
- Affected versionversion=6.9.1
- Affected versionversion=6.9.2
- Affected versionversion=7.0.1
- Affected versionversion=7.0.12
- Affected versionversion=7.0.14
- Affected versionversion=7.0.2
- Affected versionversion=7.10.1
- Affected versionversion=7.10.2
- Affected versionversion=7.1.1
- Affected versionversion=7.1.15
- Affected versionversion=7.1.2
- Affected versionversion=7.1.3
- Affected versionversion=7.2.0
- Affected versionversion=7.2.1
- Affected versionversion=7.2.2
- Affected versionversion=7.3.1
- Affected versionversion=7.3.15
- Affected versionversion=7.3.2
- Affected versionversion=7.3.3
- Affected versionversion=7.3.5
- Affected versionversion=7.4.1
- Affected versionversion=7.4.2
- Affected versionversion=7.5.1
- Affected versionversion=7.5.2
- Affected versionversion=7.5.3
- Affected versionversion=7.5.4
- Affected versionversion=7.5.5
- Affected versionversion=7.6.1
- Affected versionversion=7.6.2
- Affected versionversion=7.7.1
- Affected versionversion=7.7.2
- Affected versionversion=7.7.21
- Affected versionversion=7.8.1
- Affected versionversion=7.8.2
- Affected versionversion=7.9.1
- Affected versionversion=7.9.2
- Affected versionversion=7.9.21
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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