eBGP session disruption via shared rate-limiter exhaustion
Published Feb 28, 2024 · Updated Aug 16, 2024
Resource exhaustion in Cisco NX-OS Software allows remote attackers to drop eBGP neighbor sessions by forwarding crafted traffic. The eBGP implementation maps qualifying transit traffic into a shared hardware rate-limiter queue, allowing a flood to exhaust that queue. Exposure requires a listed Nexus switch or line card, a vulnerable release, and at least one eBGP peer; exploitation interrupts routing availability by dropping neighbor sessions.
Summary
What happened
Resource exhaustion in Cisco NX-OS Software allows remote attackers to drop eBGP neighbor sessions by forwarding crafted traffic. The eBGP implementation maps qualifying transit traffic into a shared hardware rate-limiter queue, allowing a flood to exhaust that queue. Exposure requires a listed Nexus switch or line card, a vulnerable release, and at least one eBGP peer; exploitation interrupts routing availability by dropping neighbor sessions.
The record
- CVE
- CVE-2024-20321
- Published
- Feb 28, 2024
- Updated
- Aug 16, 2024
- Vendor
- ClamAV
- Product
- Cisco NX-OS Software
- Classifications
- CWE-400, CWE-770, T1498
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 28, 2024CVE publishedPublication date reported by the CVE source.
- Aug 16, 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=10.1(1)
- Affected versionversion=10.1(2)
- Affected versionversion=10.1(2t)
- Affected versionversion=10.2(1)
- Affected versionversion=10.2(1q)
- Affected versionversion=10.2(2)
- Affected versionversion=10.2(3)
- Affected versionversion=10.2(3t)
- Affected versionversion=10.2(3v)
- Affected versionversion=10.2(4)
- Affected versionversion=10.2(5)
- Affected versionversion=10.2(6)
- Affected versionversion=10.3(1)
- Affected versionversion=10.3(2)
- Affected versionversion=10.3(3)
- Affected versionversion=10.3(4a)
- Affected versionversion=10.3(99w)
- Affected versionversion=10.3(99x)
- Affected versionversion=10.4(1)
- Affected versionversion=7.0(3)F1(1)
- Affected versionversion=7.0(3)F2(1)
- Affected versionversion=7.0(3)F2(2)
- Affected versionversion=7.0(3)F3(1)
- Affected versionversion=7.0(3)F3(2)
- Affected versionversion=7.0(3)F3(3)
- Affected versionversion=7.0(3)F3(3a)
- Affected versionversion=7.0(3)F3(3c)
- Affected versionversion=7.0(3)F3(4)
- Affected versionversion=7.0(3)F3(5)
- Affected versionversion=9.2(1)
- Affected versionversion=9.2(2)
- Affected versionversion=9.2(2t)
- Affected versionversion=9.2(2v)
- Affected versionversion=9.2(3)
- Affected versionversion=9.2(4)
- Affected versionversion=9.3(1)
- Affected versionversion=9.3(10)
- Affected versionversion=9.3(11)
- Affected versionversion=9.3(12)
- Affected versionversion=9.3(2)
- Affected versionversion=9.3(3)
- Affected versionversion=9.3(4)
- Affected versionversion=9.3(5)
- Affected versionversion=9.3(6)
- Affected versionversion=9.3(7)
- Affected versionversion=9.3(7a)
- Affected versionversion=9.3(8)
- Affected versionversion=9.3(9)
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.
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Technologies
Your stack
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Your stack
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