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NVD / CVE Program· CNA apache

CVE-2024-42516: Apache HTTP Server: HTTP response splitting

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.81% (FIRST EPSS); higher than 56.8% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Apache Software Foundation Apache HTTP Server 2.4.64; azl3 httpd 2.4.62-1 on Azure Linux 3.0 2.4.64-1; azl3 httpd 2.4.64-1 on Azure Linux 3.0 2.4.64-1.

Low priority for now. Upgrade to Apache Software Foundation Apache HTTP Server 2.4.64; azl3 httpd 2.4.62-1 on Azure Linux 3.0 2.4.64-1; azl3 httpd 2.4.64-1 on Azure Linux 3.0 2.4.64-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

HTTP response splitting in the core of Apache HTTP Server allows an attacker who can manipulate the Content-Type response headers of applications hosted or proxied by the server can split the HTTP response. This vulnerability was described as CVE-2023-38709 but the patch included in Apache HTTP Server 2.4.59 did not address the issue. Users are recommended to upgrade to version 2.4.64, which fixes this issue.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Jul 10, 2025
Updated
Jun 17, 2026
EPSS
0.8% · 56th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.8%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2024-42516

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
apachehttp server

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When you'll hear from us

  • when a new CVE affecting this product is published
  • when a record in your stack enters KEV or gets exploit code

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Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
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Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • apache http server2.4.0 and later · before 2.4.64

Versions reported by the vendor

Affected version ranges reported by the assigning authority (apache). Independent of NVD's CPE analysis and usually ahead of it.

  • Apache Software Foundation Apache HTTP Server

    • 2.4.0 and later · up to and including 2.4.63affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10httpdbefore 2.4.63-13.el10_2.42.4.63-13.el10_2.4
AlmaLinux:10httpd-corebefore 2.4.63-13.el10_2.42.4.63-13.el10_2.4
AlmaLinux:10httpd-develbefore 2.4.63-13.el10_2.42.4.63-13.el10_2.4
AlmaLinux:10httpd-filesystembefore 2.4.63-13.el10_2.42.4.63-13.el10_2.4
AlmaLinux:10httpd-manualbefore 2.4.63-13.el10_2.42.4.63-13.el10_2.4
AlmaLinux:10httpd-toolsbefore 2.4.63-13.el10_2.42.4.63-13.el10_2.4
AlmaLinux:10mod_ldapbefore 2.4.63-13.el10_2.42.4.63-13.el10_2.4
AlmaLinux:10mod_luabefore 2.4.63-13.el10_2.42.4.63-13.el10_2.4
AlmaLinux:10mod_proxy_htmlbefore 1:2.4.63-13.el10_2.41:2.4.63-13.el10_2.4
AlmaLinux:10mod_sessionbefore 2.4.63-13.el10_2.42.4.63-13.el10_2.4
AlmaLinux:10mod_sslbefore 1:2.4.63-13.el10_2.41:2.4.63-13.el10_2.4
AlmaLinux:8httpdbefore 2.4.37-65.module_el8.10.0+4233+8b7d9181.92.4.37-65.module_el8.10.0+4233+8b7d9181.9
AlmaLinux:8httpd-develbefore 2.4.37-65.module_el8.10.0+4233+8b7d9181.92.4.37-65.module_el8.10.0+4233+8b7d9181.9
AlmaLinux:8httpd-manualbefore 2.4.37-65.module_el8.10.0+4233+8b7d9181.92.4.37-65.module_el8.10.0+4233+8b7d9181.9
AlmaLinux:8httpd-toolsbefore 2.4.37-65.module_el8.10.0+4233+8b7d9181.92.4.37-65.module_el8.10.0+4233+8b7d9181.9
AlmaLinux:8mod_http2before 1.15.7-10.module_el8.10.0+4233+8b7d9181.71.15.7-10.module_el8.10.0+4233+8b7d9181.7
AlmaLinux:8mod_ldapbefore 2.4.37-65.module_el8.10.0+4233+8b7d9181.92.4.37-65.module_el8.10.0+4233+8b7d9181.9
AlmaLinux:8mod_mdbefore 1:2.0.8-8.module_el8.10.0+4088+57f011c1.21:2.0.8-8.module_el8.10.0+4088+57f011c1.2
AlmaLinux:8mod_proxy_htmlbefore 1:2.4.37-65.module_el8.10.0+4233+8b7d9181.91:2.4.37-65.module_el8.10.0+4233+8b7d9181.9
AlmaLinux:8mod_sessionbefore 2.4.37-65.module_el8.10.0+4233+8b7d9181.92.4.37-65.module_el8.10.0+4233+8b7d9181.9
AlmaLinux:8mod_sslbefore 1:2.4.37-65.module_el8.10.0+4233+8b7d9181.91:2.4.37-65.module_el8.10.0+4233+8b7d9181.9
AlmaLinux:9httpdbefore 2.4.62-13.el9_8.52.4.62-13.el9_8.5
AlmaLinux:9httpd-corebefore 2.4.62-13.el9_8.52.4.62-13.el9_8.5
AlmaLinux:9httpd-develbefore 2.4.62-13.el9_8.52.4.62-13.el9_8.5

+96

Same product

apache: all records

Other highest-scoring records for the same primary product.

  • CVE-2021-42013Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)KEV
    99Now
  • CVE-2021-41773Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49KEV
    99Now
  • CVE-2024-38475Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path.KEV
    96Now

Published before and after this one in the same product

  • ← EarlierCVE-2024-40898Jul 18, 2024 · Apache HTTP Server: SSRF with mod_rewrite in server/vhost context on Windows
    30Monitor
  • ← EarlierCVE-2025-3891Apr 29, 2025 · Mod_auth_openidc: dos via empty post in mod_auth_openidc with oidcpreservepost enabled
    30Monitor
  • Later →CVE-2024-43204Jul 10, 2025 · Apache HTTP Server: SSRF with mod_headers setting Content-Type header
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Apache Software Foundation Apache HTTP Server2.4.64 · descriptionVendor (CNA)
azl3 httpd 2.4.62-1 on Azure Linux 3.02.4.64-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 httpd 2.4.64-1 on Azure Linux 3.02.4.64-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 httpd 2.4.62-1 on CBL Mariner 2.02.4.64-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 httpd 2.4.64-1 on CBL Mariner 2.02.4.64-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:httpd2.4.63-13.el10_2.4 · AlmaLinux:10Package registry (OSV)
almalinux:httpd-core2.4.63-13.el10_2.4 · AlmaLinux:10Package registry (OSV)
almalinux:httpd-devel2.4.63-13.el10_2.4 · AlmaLinux:10Package registry (OSV)
almalinux:httpd-filesystem2.4.63-13.el10_2.4 · AlmaLinux:10Package registry (OSV)
almalinux:httpd-manual2.4.63-13.el10_2.4 · AlmaLinux:10Package registry (OSV)
almalinux:httpd-tools2.4.63-13.el10_2.4 · AlmaLinux:10Package registry (OSV)
almalinux:mod_http21.15.7-10.module_el8.10.0+4233+8b7d9181.7 · AlmaLinux:8Package registry (OSV)
almalinux:mod_ldap2.4.63-13.el10_2.4 · AlmaLinux:10Package registry (OSV)
almalinux:mod_lua2.4.63-13.el10_2.4 · AlmaLinux:10Package registry (OSV)
almalinux:mod_proxy_html1:2.4.63-13.el10_2.4 · AlmaLinux:10Package registry (OSV)
almalinux:mod_session2.4.63-13.el10_2.4 · AlmaLinux:10Package registry (OSV)
almalinux:mod_ssl1:2.4.63-13.el10_2.4 · AlmaLinux:10Package registry (OSV)
alpine:apache22.4.64-r0 · Alpine:v3.19Package registry (OSV)
debian:apache22.4.65-1~deb12u1 · Debian:12Package registry (OSV)
opensuse:apache22.4.58-150600.5.35.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:apache2-devel2.4.58-150600.5.35.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:apache2-event2.4.58-150600.5.35.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:apache2-manual2.4.58-150600.5.35.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:apache2-prefork2.4.58-150600.5.35.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:apache2-utils2.4.58-150600.5.35.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:apache2-worker2.4.58-150600.5.35.1 · openSUSE:Leap 15.6Package registry (OSV)
red hat:httpd0:2.4.63-13.el10_2.4 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:httpd-core0:2.4.63-13.el10_2.4 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:httpd-core-debuginfo0:2.4.63-13.el10_2.4 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:httpd-debuginfo0:2.4.63-13.el10_2.4 · Red Hat:enterprise_linux:10.2Package registry (OSV)

+19

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2024-39573374 days apartApache HTTP Server: mod_rewrite proxy handler substitution
    41Plan

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
high · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
None

Weakness class (CWE)

CWE-20 · Improper Input Validation

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records