CVE-2022-20823Network attack vector

Device reload via malformed OSPFv3 LSA

Published Aug 25, 2022 · Updated Nov 6, 2024

Out-of-bounds read in Cisco NX-OS Software allows remote attackers to reload affected devices via a malicious OSPFv3 LSA. The OSPFv3 process incompletely validates a received link-state advertisement and reads beyond its intended buffer, causing repeated process crashes. Exploitation requires OSPFv3 on an interface and a full neighbor state; absent a configured virtual link, the attacker must be Layer 2 adjacent, and repeated crashes reload the device.

CVSS severity8.6
High
EPSS probability1.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Cisco NX-OS Software allows remote attackers to reload affected devices via a malicious OSPFv3 LSA. The OSPFv3 process incompletely validates a received link-state advertisement and reads beyond its intended buffer, causing repeated process crashes. Exploitation requires OSPFv3 on an interface and a full neighbor state; absent a configured virtual link, the attacker must be Layer 2 adjacent, and repeated crashes reload the device.

The record

CVE
CVE-2022-20823
Published
Aug 25, 2022
Updated
Nov 6, 2024
Vendor
ClamAV
Product
Cisco NX-OS Software
Classifications
CWE-126, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 6, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco NX-OS Softwareversion=n/a

Published CVSS scores

8.6CiscoCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-126Buffer Over-read
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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