CVE-2022-26372Network attack vector

Denial of service via DNS memory exhaustion

Published May 5, 2022 · Updated Sep 16, 2024

Resource exhaustion in F5 BIG-IP 15.1.x before 15.1.0.2 and other affected branches allows remote attackers to interrupt DNS service. The DNS queueing path on a virtual-server DNS listener consumes increasing memory while processing undisclosed requests; F5 has not disclosed the underlying operation. Network access to a configured DNS listener is sufficient, DNS queueing is enabled by default, and continued memory growth impairs availability.

CVSS severity7.5
High
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in F5 BIG-IP 15.1.x before 15.1.0.2 and other affected branches allows remote attackers to interrupt DNS service. The DNS queueing path on a virtual-server DNS listener consumes increasing memory while processing undisclosed requests; F5 has not disclosed the underlying operation. Network access to a configured DNS listener is sufficient, DNS queueing is enabled by default, and continued memory growth impairs availability.

The record

CVE
CVE-2022-26372
Published
May 5, 2022
Updated
Sep 16, 2024
Vendor
F5 Networks
Product
BIG-IP
Classifications
CWE-400, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 5, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=11.6.x
  2. Affected versionversion=12.1.x
  3. Affected versionversion=13.1.x <13.1.5
  4. Affected versionversion=14.1.x <14.1.4.6
  5. Affected versionversion=15.1.x <15.1.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · BIG-IPversion=11.6.x; version=12.1.x; version=13.1.x <13.1.5; version=14.1.x <14.1.4.6; version=15.1.x <15.1.0.2

Published CVSS scores

7.5F5 NetworksCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.003Application Exhaustion Flood

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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