CVE-2024-21789Network attack vector

Unauthenticated denial of service via memory exhaustion

Published Feb 14, 2024 · Updated Apr 24, 2025

Denial of service in F5 BIG-IP 17.1.0 allows remote attackers to exhaust memory through requests to an ASM or Advanced WAF virtual server. F5 reports rising memory use when a security policy is configured but does not disclose the request structure or the precise resource-release failure. The condition is reachable without authentication over the network and can interrupt service through memory exhaustion; no data disclosure or modification is reported.

CVSS severity7.5
High
EPSS probability0.52%
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 17.1.0 allows remote attackers to exhaust memory through requests to an ASM or Advanced WAF virtual server. F5 reports rising memory use when a security policy is configured but does not disclose the request structure or the precise resource-release failure. The condition is reachable without authentication over the network and can interrupt service through memory exhaustion; no data disclosure or modification is reported.

The record

CVE
CVE-2024-21789
Published
Feb 14, 2024
Updated
Apr 24, 2025
Vendor
F5 Networks
Product
BIG-IP
Classifications
CWE-772, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 14, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 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=15.1.0 <=*
  2. Affected versionversion=16.1.0 <=*
  3. Affected versionversion=17.1.0 <17.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · BIG-IPversion=15.1.0 <=*; version=16.1.0 <=*; version=17.1.0 <17.1.1

Published CVSS scores

7.5F5 NetworksCVSS: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-772Missing Release of Resource after Effective Lifetime
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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