CVE-2020-3172

Root code execution via malformed CDP headers

Published Feb 26, 2020 · Updated Nov 15, 2024

Buffer overflow in Cisco UCS Software allows adjacent attackers to execute code as root or interrupt service with a crafted CDP packet. The Cisco Discovery Protocol parser insufficiently validates packet headers before processing them, permitting attacker-controlled header values to overflow a buffer. Access requires Layer 2 adjacency in the same broadcast domain, and affected UCS 6200 or 6300 Fabric Interconnects keep CDP enabled on several port types.

CVSS severity8.8
High
EPSS probability1.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Cisco UCS Software allows adjacent attackers to execute code as root or interrupt service with a crafted CDP packet. The Cisco Discovery Protocol parser insufficiently validates packet headers before processing them, permitting attacker-controlled header values to overflow a buffer. Access requires Layer 2 adjacency in the same broadcast domain, and affected UCS 6200 or 6300 Fabric Interconnects keep CDP enabled on several port types.

The record

CVE
CVE-2020-3172
Published
Feb 26, 2020
Updated
Nov 15, 2024
Vendor
ClamAV
Product
Cisco Unified Computing System (Managed)
Classifications
CWE-20, T1210
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 26, 2020CVE publishedPublication date reported by the CVE source.
  2. Nov 15, 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?

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  1. Affected versionversion=unspecified <n/a

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco Unified Computing System (Managed)version=unspecified <n/a

Published CVSS scores

8.8CiscoCVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1210Exploitation of Remote Services

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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