CVE-2024-38474: Substitution encoding issue in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows attacker to execute

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CRITICAL 9.8REMOTEWATCHLISTUPGRADEMITIGATE

CVE-2024-38474 is a critical-severity flaw (CVSS 9.8) affecting http server, clustered data ontap. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Substitution encoding issue in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows attacker to execute scripts in directories permitted by the configuration but not directly reachable by any URL or source disclosure of scripts meant to only to be executed as CGI. Users are recommended to upgrade to version 2.4.60, which fixes this issue. Some RewriteRules that capture and substitute unsafely will now fail unless rewrite flag "UnsafeAllo

Why this priority

Critical severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.5% (top 16%)
CISA exploited list	No
Weakness	CWE-116
Published	2024-07-01
Last modified	2026-06-17

Publisher (CNA): Apache Software Foundation · Vendor: apache · netapp

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-07-01 19:15 UTCPublished CVE record published
2026-06-17 07:40 UTCUpdated Record last modified

apache http server UPGRADE

Affected: >= 2.4.0 and < 2.4.60

Fixed in: 2.4.60

Safe to downgrade to: a release before 2.4.0

1. Check installed version

apt-cache policy http-server || rpm -q http-server || http-server --version

2. UPGRADE to 2.4.60 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade http-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade http-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.4.0 (Debian / Ubuntu)

apt-cache madison http-server sudo apt install http-server=<VERSION_BEFORE_2.4.0> sudo apt-mark hold http-server

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list http-server sudo dnf downgrade http-server-<VERSION_BEFORE_2.4.0> sudo dnf versionlock add http-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

netapp clustered data ontap MITIGATE

Affected: 9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · sbcl · FIXED · 2.6.10-1.fc46 · FEDORA-2026-feab1a81c6 · source

sudo dnf upgrade --advisory=FEDORA-2026-feab1a81c6

Fedora ELN · python-archspec · FIXED · 0.2.7-1.eln159 · FEDORA-2026-e2a8272db6 · source

sudo dnf upgrade --advisory=FEDORA-2026-e2a8272db6

Ubuntu 20.04 · apache2 · FIXED · 2.4.41-4ubuntu3.23

sudo apt update && sudo apt install --only-upgrade apache2 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' apache2)" ge "2.4.41-4ubuntu3.23" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 22.04 · apache2 · FIXED · 2.4.52-1ubuntu4.16

sudo apt update && sudo apt install --only-upgrade apache2 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' apache2)" ge "2.4.52-1ubuntu4.16" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 24.04 · apache2 · FIXED · 2.4.58-1ubuntu8.8

sudo apt update && sudo apt install --only-upgrade apache2 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' apache2)" ge "2.4.58-1ubuntu8.8" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 24.10 · apache2 · FIXED · 2.4.62-1ubuntu1.1

sudo apt update && sudo apt install --only-upgrade apache2 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' apache2)" ge "2.4.62-1ubuntu1.1" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 25.04 · apache2 · FIXED · 2.4.62-1ubuntu1

sudo apt update && sudo apt install --only-upgrade apache2 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' apache2)" ge "2.4.62-1ubuntu1" && echo PATCHED || echo STILL-VULNERABLE

Debian 12 · apache2 · FIXED · 2.4.61-1~deb12u1

sudo apt update && sudo apt install --only-upgrade apache2 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' apache2)" ge "2.4.61-1~deb12u1" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · apache2 · FIXED · 2.4.60-1

sudo apt update && sudo apt install --only-upgrade apache2 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' apache2)" ge "2.4.60-1" && echo PATCHED || echo STILL-VULNERABLE

RHEL 7.7 Advanced Update Support · httpd · FIXED · httpd-2.4.6-90.el7_7.4

sudo dnf upgrade --advisory=RHSA-2024:4938 rpm -q httpd

RHEL 7 Extended Lifecycle Support · httpd · FIXED · httpd-2.4.6-99.el7_9.2

sudo dnf upgrade --advisory=RHSA-2024:4943 rpm -q httpd

RHEL 9 · httpd · FIXED · httpd-2.4.57-11.el9_4

sudo dnf upgrade --advisory=RHSA-2024:4726 rpm -q httpd

RHEL 9.0 Update Services for SAP Solutions · httpd · FIXED · httpd-2.4.51-7.el9_0.7

sudo dnf upgrade --advisory=RHSA-2024:4863 rpm -q httpd

RHEL 9.2 Extended Update Support · httpd · FIXED · httpd-2.4.53-11.el9_2.8

sudo dnf upgrade --advisory=RHSA-2024:4862 rpm -q httpd

Alpine 3.20 · apache2 · FIXED · apache2-2.4.60-r0

apk add --upgrade apache2 apk info -v apache2

Alpine 3.21 · apache2 · FIXED · apache2-2.4.60-r0

apk add --upgrade apache2 apk info -v apache2

Alpine 3.22 · apache2 · FIXED · apache2-2.4.60-r0

apk add --upgrade apache2 apk info -v apache2

Alpine 3.23 · apache2 · FIXED · apache2-2.4.60-r0

apk add --upgrade apache2 apk info -v apache2

Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2024-656 · source

sudo dnf update --advisory=ALAS2023-2024-656

Amazon Linux 2 · see advisory · FIXED · ALAS2-2024-2594 · source

sudo yum update --advisory=ALAS2-2024-2594

Amazon Linux 1 · see advisory · FIXED · ALAS-2024-1944 · source

sudo yum update --advisory=ALAS-2024-1944

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-38474?

http server: upgrade to 2.4.60; clustered data ontap: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-38474 being exploited?

CVE-2024-38474 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-38474 affect?

CVE-2024-38474 affects http server, clustered data ontap. Severity is critical (CVSS 9.8). Substitution encoding issue in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows attacker to execute scripts in directories permitted by the configuration but not directly reachable by any URL or source disclosure of scripts meant

How urgent is CVE-2024-38474?

Priority 65/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Apache HTTP Server vulnerabilities

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References

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