CVE-2023-20047

LLDP process crash via memory exhaustion

Published Jan 19, 2023 · Updated Aug 2, 2024

Uncontrolled resource consumption in Cisco Webex Room Phone 1.2.0 and earlier allows attackers to crash LLDP via crafted local-network traffic. The LLDP feature fails to bound memory consumption while processing crafted traffic, exhausting device memory until its process crashes. LLDP is enabled by default; on LLDP-only deployments, the crash interrupts inbound and outbound calling until a manual restart.

CVSS severity6.5
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Cisco Webex Room Phone 1.2.0 and earlier allows attackers to crash LLDP via crafted local-network traffic. The LLDP feature fails to bound memory consumption while processing crafted traffic, exhausting device memory until its process crashes. LLDP is enabled by default; on LLDP-only deployments, the crash interrupts inbound and outbound calling until a manual restart.

The record

CVE
CVE-2023-20047
Published
Jan 19, 2023
Updated
Aug 2, 2024
Vendor
ClamAV
Product
Cisco Webex Room Phone
Classifications
CWE-400, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 19, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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.

  1. Affected versionversion=RoomPhone 1.1.0
  2. Affected versionversion=RoomPhone 1.2.0
  3. Affected versionversion=RoomPhone 1.2.0SR1
  4. Affected versionversion=RoomPhone 1.2.0SR2

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco Webex Room Phoneversion=RoomPhone 1.1.0; version=RoomPhone 1.2.0; version=RoomPhone 1.2.0SR1; version=RoomPhone 1.2.0SR2

Published CVSS scores

6.5Cisco PSIRTCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-400Uncontrolled Resource Consumption
T1499Endpoint Denial of Service

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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