Authenticated appliance reload via crafted SNMP request
Published Aug 23, 2023 · Updated Jul 1, 2025
Improper SNMP request handling in Cisco FXOS and UCS Software allows remote authenticated users to reload affected appliances. The SNMP service enters a loop with no reachable exit when it processes a crafted request, forcing the device to reload. SNMP must be enabled; SNMPv2c or earlier requires the configured community string, while SNMPv3 requires valid user credentials.
Summary
What happened
Improper SNMP request handling in Cisco FXOS and UCS Software allows remote authenticated users to reload affected appliances. The SNMP service enters a loop with no reachable exit when it processes a crafted request, forcing the device to reload. SNMP must be enabled; SNMPv2c or earlier requires the configured community string, while SNMPv3 requires valid user credentials.
The record
- CVE
- CVE-2023-20200
- Published
- Aug 23, 2023
- Updated
- Jul 1, 2025
- Vendor
- ClamAV
- Product
- Cisco Unified Computing System (Managed)
- Classifications
- CWE-835, CWE-732, T1499.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 23, 2023CVE publishedPublication date reported by the CVE source.
- Jul 1, 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=3.1(1e)
- Affected versionversion=3.1(1g)
- Affected versionversion=3.1(1h)
- Affected versionversion=3.1(1k)
- Affected versionversion=3.1(1l)
- Affected versionversion=3.1(2b)
- Affected versionversion=3.1(2c)
- Affected versionversion=3.1(2d)
- Affected versionversion=3.1(2e)
- Affected versionversion=3.1(2f)
- Affected versionversion=3.1(2g)
- Affected versionversion=3.1(2h)
- Affected versionversion=3.1(3a)
- Affected versionversion=3.1(3b)
- Affected versionversion=3.1(3c)
- Affected versionversion=3.1(3d)
- Affected versionversion=3.1(3e)
- Affected versionversion=3.1(3f)
- Affected versionversion=3.1(3h)
- Affected versionversion=3.1(3j)
- Affected versionversion=3.1(3k)
- Affected versionversion=3.1(3l)
- Affected versionversion=3.2(1d)
- Affected versionversion=3.2(2b)
- Affected versionversion=3.2(2c)
- Affected versionversion=3.2(2d)
- Affected versionversion=3.2(2e)
- Affected versionversion=3.2(2f)
- Affected versionversion=3.2(3a)
- Affected versionversion=3.2(3b)
- Affected versionversion=3.2(3d)
- Affected versionversion=3.2(3e)
- Affected versionversion=3.2(3g)
- Affected versionversion=3.2(3h)
- Affected versionversion=3.2(3i)
- Affected versionversion=3.2(3j)
- Affected versionversion=3.2(3k)
- Affected versionversion=3.2(3l)
- Affected versionversion=3.2(3n)
- Affected versionversion=3.2(3o)
- Affected versionversion=3.2(3p)
- Affected versionversion=4.0(1a)
- Affected versionversion=4.0(1b)
- Affected versionversion=4.0(1c)
- Affected versionversion=4.0(1d)
- Affected versionversion=4.0(2a)
- Affected versionversion=4.0(2b)
- Affected versionversion=4.0(2d)
- Affected versionversion=4.0(2e)
- Affected versionversion=4.0(4a)
- Affected versionversion=4.0(4b)
- Affected versionversion=4.0(4c)
- Affected versionversion=4.0(4d)
- Affected versionversion=4.0(4e)
- Affected versionversion=4.0(4f)
- Affected versionversion=4.0(4g)
- Affected versionversion=4.0(4h)
- Affected versionversion=4.0(4i)
- Affected versionversion=4.0(4k)
- Affected versionversion=4.0(4l)
- Affected versionversion=4.0(4m)
- Affected versionversion=4.0(4n)
- Affected versionversion=4.0(4o)
- Affected versionversion=4.1(1a)
- Affected versionversion=4.1(1b)
- Affected versionversion=4.1(1c)
- Affected versionversion=4.1(1d)
- Affected versionversion=4.1(1e)
- Affected versionversion=4.1(2a)
- Affected versionversion=4.1(2b)
- Affected versionversion=4.1(2c)
- Affected versionversion=4.1(3a)
- Affected versionversion=4.1(3b)
- Affected versionversion=4.1(3c)
- Affected versionversion=4.1(3d)
- Affected versionversion=4.1(3e)
- Affected versionversion=4.1(3f)
- Affected versionversion=4.1(3h)
- Affected versionversion=4.1(3i)
- Affected versionversion=4.1(3j)
- Affected versionversion=4.1(3k)
- Affected versionversion=4.2(1c)
- Affected versionversion=4.2(1d)
- Affected versionversion=4.2(1f)
- Affected versionversion=4.2(1i)
- Affected versionversion=4.2(1k)
- Affected versionversion=4.2(1l)
- Affected versionversion=4.2(1m)
- Affected versionversion=4.2(1n)
- Affected versionversion=4.2(2a)
- Affected versionversion=4.2(2c)
- Affected versionversion=4.2(2d)
- Affected versionversion=4.2(2e)
- Affected versionversion=4.2(3b)
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
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Technologies
Your stack
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Your stack
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