Control-plane hang via crafted VLAN-tagged frames
Published Sep 25, 2024 · Updated Oct 7, 2024
Denial of service in Cisco IOS XE Software allows adjacent attackers to make an affected device's control plane unresponsive. The frame-processing path improperly handles VLAN tag information in crafted Layer 2 frames, leaving control-plane services hung. Exploitation requires adjacency to an affected Catalyst 9000 switch; management access stops and recovery requires a reload, while transit traffic continues through the data plane.
Summary
What happened
Denial of service in Cisco IOS XE Software allows adjacent attackers to make an affected device's control plane unresponsive. The frame-processing path improperly handles VLAN tag information in crafted Layer 2 frames, leaving control-plane services hung. Exploitation requires adjacency to an affected Catalyst 9000 switch; management access stops and recovery requires a reload, while transit traffic continues through the data plane.
The record
- CVE
- CVE-2024-20434
- Published
- Sep 25, 2024
- Updated
- Oct 7, 2024
- Vendor
- ClamAV
- Product
- Cisco IOS XE Software
- Classifications
- CWE-190, T1499
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 25, 2024CVE publishedPublication date reported by the CVE source.
- Oct 7, 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=16.10.1e
- Affected versionversion=16.10.1s
- Affected versionversion=16.11.1
- Affected versionversion=16.11.1b
- Affected versionversion=16.11.1s
- Affected versionversion=16.12.1
- Affected versionversion=16.12.1c
- Affected versionversion=16.12.1s
- Affected versionversion=16.12.2
- Affected versionversion=16.12.2s
- Affected versionversion=16.12.3
- Affected versionversion=16.12.3a
- Affected versionversion=16.12.3s
- Affected versionversion=16.12.4
- Affected versionversion=16.12.4a
- Affected versionversion=16.12.5
- Affected versionversion=16.12.5b
- Affected versionversion=16.12.6
- Affected versionversion=16.12.6a
- Affected versionversion=16.12.7
- Affected versionversion=16.12.8
- Affected versionversion=16.6.1
- Affected versionversion=16.6.10
- Affected versionversion=16.6.2
- Affected versionversion=16.6.3
- Affected versionversion=16.6.4
- Affected versionversion=16.6.4a
- Affected versionversion=16.6.5
- Affected versionversion=16.6.6
- Affected versionversion=16.6.7
- Affected versionversion=16.6.8
- Affected versionversion=16.6.9
- Affected versionversion=16.7.1
- Affected versionversion=16.8.1
- Affected versionversion=16.8.1a
- Affected versionversion=16.8.1s
- Affected versionversion=16.9.1
- 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=16.9.6
- Affected versionversion=16.9.7
- Affected versionversion=16.9.8
- Affected versionversion=17.10.1
- Affected versionversion=17.10.1b
- Affected versionversion=17.1.1
- Affected versionversion=17.11.1
- Affected versionversion=17.11.99SW
- Affected versionversion=17.1.1s
- Affected versionversion=17.1.1t
- Affected versionversion=17.12.1
- Affected versionversion=17.12.2
- Affected versionversion=17.12.3
- Affected versionversion=17.1.3
- Affected versionversion=17.13.1
- Affected versionversion=17.14.1
- Affected versionversion=17.2.1
- Affected versionversion=17.2.1a
- Affected versionversion=17.3.1
- Affected versionversion=17.3.2
- Affected versionversion=17.3.2a
- Affected versionversion=17.3.3
- Affected versionversion=17.3.4
- Affected versionversion=17.3.4b
- Affected versionversion=17.3.5
- Affected versionversion=17.3.6
- Affected versionversion=17.3.7
- Affected versionversion=17.3.8
- Affected versionversion=17.3.8a
- Affected versionversion=17.4.1
- Affected versionversion=17.5.1
- Affected versionversion=17.6.1
- Affected versionversion=17.6.2
- Affected versionversion=17.6.3
- Affected versionversion=17.6.4
- Affected versionversion=17.6.5
- Affected versionversion=17.6.5a
- Affected versionversion=17.6.6
- Affected versionversion=17.6.6a
- Affected versionversion=17.6.7
- Affected versionversion=17.7.1
- Affected versionversion=17.8.1
- Affected versionversion=17.9.1
- Affected versionversion=17.9.2
- Affected versionversion=17.9.3
- Affected versionversion=17.9.4
- Affected versionversion=17.9.4a
- Affected versionversion=17.9.5
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.
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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