CVE-2024-11148Public exploitNetwork attack vector

Remote service crash via malformed FastCGI request

Published Dec 5, 2024 · Updated Dec 6, 2024

Denial of service in affected OpenBSD httpd(8) releases allows remote attackers to crash the server via a malformed FastCGI request. With FastCGI enabled, an extra byte after a zero-length chunked request body leaves the request path in a state that dereferences a NULL pointer. The attack is unauthenticated and network-reachable, but only FastCGI-enabled configurations are exposed; affected releases are 7.4 before errata 006 and 7.3 before errata 020.

CVSS severity8.7
High
EPSS probability0.44%
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 affected OpenBSD httpd(8) releases allows remote attackers to crash the server via a malformed FastCGI request. With FastCGI enabled, an extra byte after a zero-length chunked request body leaves the request path in a state that dereferences a NULL pointer. The attack is unauthenticated and network-reachable, but only FastCGI-enabled configurations are exposed; affected releases are 7.4 before errata 006 and 7.3 before errata 020.

The record

CVE
CVE-2024-11148
Published
Dec 5, 2024
Updated
Dec 6, 2024
Vendor
OpenBSD Project
Product
OpenBSD
Classifications
CWE-476, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 5, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.3 <7.3 errata 020
  2. Affected versionversion=7.3_errata020
  3. Affected versionversion=7.4 <7.4 errata 006
  4. Affected versionversion=7.4_errata006

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenBSD Project · OpenBSDversion=7.3 <7.3 errata 020; version=7.3_errata020; version=7.4 <7.4 errata 006; version=7.4_errata006

Published CVSS scores

7.5CISA CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7CISA CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/AU:Y

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

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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