CVE-2021-1131

Adjacent denial of service via unchecked protocol packet

Published Jan 13, 2021 · Updated Nov 12, 2024

Denial of service in Cisco Video Surveillance 8000 Series IP Cameras before 1.0.9-8 allows attackers to reload them via a crafted Layer 2 packet. The Cisco Discovery Protocol implementation omits required checks while processing untrusted protocol messages, causing an unexpected camera restart. Exploitation requires Cisco Discovery Protocol to be enabled and Layer 2 access to the same broadcast domain; the consequence is loss of service during the reload.

CVSS severity6.5
Medium
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Cisco Video Surveillance 8000 Series IP Cameras before 1.0.9-8 allows attackers to reload them via a crafted Layer 2 packet. The Cisco Discovery Protocol implementation omits required checks while processing untrusted protocol messages, causing an unexpected camera restart. Exploitation requires Cisco Discovery Protocol to be enabled and Layer 2 access to the same broadcast domain; the consequence is loss of service during the reload.

The record

CVE
CVE-2021-1131
Published
Jan 13, 2021
Updated
Nov 12, 2024
Vendor
ClamAV
Product
Cisco Video Surveillance 8000 Series IP Cameras
Classifications
CWE-119, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Nov 12, 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=n/a

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco Video Surveillance 8000 Series IP Camerasversion=n/a

Published CVSS scores

6.5CiscoCVSS: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.

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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-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499.004Application or System Exploitation

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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