Public proof of conceptFix available

CVE-2023-38709

Q: Is CVE-2023-38709 actively exploited?

Active exploitation of CVE-2023-38709 has not been confirmed. Its EPSS score was 3.9% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2023-38709?

CVE-2023-38709 has a CVSS v3 base score of 7.3 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

A public proof of concept exists; no exploitation attested.

Published2024-04-04
WeaknessCWE-1284

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Faulty input validation in the core of Apache allows malicious or exploitable backend/content generators to split HTTP responses. This issue affects Apache HTTP Server: through 2.4.58.

Timeline

dates in UTC

2024-04-0420:15CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-38709?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-38709?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV · CISA-ADP

Fedoraproject fedora

Branch	Affected	Fixed in	Source
38.x	= 38	no fix published	NVD
39.x	= 39	no fix published	NVD
40.x	= 40	no fix published	NVD

Apache HTTP Server

Branch	Affected	Fixed in	Source
2.4	< 2.4.59	2.4.59	NVD · OSV
2.4	≤ 2.4.58	no fix published	CISA-ADP

Apple macos

Branch	Affected	Fixed in	Source
14.6	< 14.6	14.6	NVD

4 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

httpdAlmaLinux:10all versions · fixed in 2.4.63-13.el10_2.4and 8 other packages
httpdAlmaLinux:9all versions · fixed in 2.4.62-1.el9and 8 other packages
httpdAlmaLinux:9all versions · fixed in 2.4.62-13.el9_8.5and 8 other packages
httpdAlmaLinux:8all versions · fixed in 2.4.37-65.module_el8.10.0+3860+a6e26e50and 6 other packages
httpdAlmaLinux:8all versions · fixed in 2.4.37-65.module_el8.10.0+4233+8b7d9181.9and 5 other packages
mod_http2AlmaLinux:8all versions · fixed in 1.15.7-10.module_el8.10.0+3832+564e7653
mod_http2AlmaLinux:8all versions · fixed in 1.15.7-10.module_el8.10.0+4233+8b7d9181.7
mod_mdAlmaLinux:8all versions · fixed in 1:2.0.8-8.module_el8.10.0+4088+57f011c1.2

7 more package ranges on OSV.dev

Full record on NVD

Fix

Advisories and patches

httpd.apache.orgVendor Advisory

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 1 repository, unverifiedmrmtwoj/apache-vulnerability-testing

Sources

NVDCVE recordread 2026-10-23
CISA-ADPSSVC decisionnone2024-04-05
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.17.32024-05-23
CISA-ADPweakness (CWE)CWE-12842024-05-23
FIRST EPSSEPSS score3.9 %2026-10-22
PoC-in-GitHubproof of concept1read 2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Published: 2024-04-04
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2023-38709?

Faulty input validation in the core of Apache allows malicious or exploitable backend/content generators to split HTTP responses. This issue affects Apache HTTP Server: through 2.4.58.

Is CVE-2023-38709 actively exploited?

Active exploitation of CVE-2023-38709 has not been confirmed. Its EPSS score was 3.9% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-38709?

CVE-2023-38709 has a CVSS v3 base score of 7.3 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

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