CVE-2023-23552Network attack vector

Denial of service via undisclosed request processing

Published Feb 1, 2023 · Updated Mar 25, 2025

Denial of service in F5 BIG-IP 13.1.x and affected 14.1.x through 17.0.x releases allows remote attackers to exhaust memory. When an Advanced WAF or ASM policy is attached to a virtual server, processing undisclosed requests increases memory use; F5 has not published the request form or faulty code path. The policy configuration and network reachability to the virtual server are required, and the bounded consequence is service interruption from memory exhaustion.

CVSS severity7.5
High
EPSS probability1.54%
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 F5 BIG-IP 13.1.x and affected 14.1.x through 17.0.x releases allows remote attackers to exhaust memory. When an Advanced WAF or ASM policy is attached to a virtual server, processing undisclosed requests increases memory use; F5 has not published the request form or faulty code path. The policy configuration and network reachability to the virtual server are required, and the bounded consequence is service interruption from memory exhaustion.

The record

CVE
CVE-2023-23552
Published
Feb 1, 2023
Updated
Mar 25, 2025
Vendor
F5 Networks
Product
BIG-IP
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 2025Record 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=13.1.0 <*
  2. Affected versionversion=14.1.0 <14.1.5.3
  3. Affected versionversion=15.1.0 <15.1.8
  4. Affected versionversion=16.1.0 <16.1.3.3
  5. Affected versionversion=17.0.0 <17.0.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · BIG-IPversion=13.1.0 <*; version=14.1.0 <14.1.5.3; version=15.1.0 <15.1.8; version=16.1.0 <16.1.3.3; version=17.0.0 <17.0.0.2

Published CVSS scores

7.5F5 NetworksCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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 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-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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