CVE-2024-38475: Apache HTTP Server Improper Escaping of Output Vulnerability

Q: How do I fix CVE-2024-38475?

http server: upgrade to 2.4.60; ontap 9: mitigate or apply the listed mitigation; sma 200 firmware: upgrade to 10.2.1.14-75sv. Exact commands for each OS are on this page.

Q: Is CVE-2024-38475 being exploited?

Yes. CVE-2024-38475 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

Q: What does CVE-2024-38475 affect?

CVE-2024-38475 affects http server, ontap 9, sma 200 firmware. Severity is critical (CVSS 9.1). Improper escaping of output in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attacker to map URLs to filesystem locations that are permitted to be served by the server but are not intentionally/directly reachable by any URL

Q: How urgent is CVE-2024-38475?

Priority 100/100. Critical severity; EPSS top 1%: very likely to be exploited; Exploited in the wild (CISA KEV); Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

100

Patch now

CRITICAL 9.1EXPLOITEDREMOTEWATCHLISTUPGRADEMITIGATEUPGRADE

CVE-2024-38475 is a critical-severity flaw (CVSS 9.1) affecting http server, ontap 9, sma 200 firmware, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper escaping of output in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attacker to map URLs to filesystem locations that are permitted to be served by the server but are not intentionally/directly reachable by any URL, resulting in code execution or source code disclosure. Substitutions in server context that use a backreferences or variables as the first segment of the substitution are affected. Some unsafe RewiteRules

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Exploited in the wild (CISA KEV)
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	100.0% (top 1%)
CISA exploited list	Yes, fix due 2025-05-22
Weakness	CWE-116
Published	2024-07-01
Last modified	2026-06-17

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

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
2025-05-01Exploited Added to the CISA Known Exploited Vulnerabilities list
2025-05-22Deadline CISA due date for US federal agencies to patch
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 ontap 9 MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ontap-9 || rpm -q ontap-9 || ontap-9 --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

sonicwall sma 200 firmware UPGRADE

Affected: < 10.2.1.14-75sv

Fixed in: 10.2.1.14-75sv

Safe to downgrade to: no unaffected older release

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.

sonicwall sma 210 firmware UPGRADE

Affected: < 10.2.1.14-75sv

Fixed in: 10.2.1.14-75sv

Safe to downgrade to: no unaffected older release

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.

sonicwall sma 400 firmware UPGRADE

Affected: < 10.2.1.14-75sv

Fixed in: 10.2.1.14-75sv

Safe to downgrade to: no unaffected older release

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.

sonicwall sma 410 firmware UPGRADE

Affected: < 10.2.1.14-75sv

Fixed in: 10.2.1.14-75sv

Safe to downgrade to: no unaffected older release

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 ELN · gram_grep · FIXED · 0.10.4-1.eln159 · FEDORA-2026-0808475f2a · source

sudo dnf upgrade --advisory=FEDORA-2026-0808475f2a

Fedora 46 · wesnoth · FIXED · 1.19.29-1.fc46 · FEDORA-2026-58f458e24e · source

sudo dnf upgrade --advisory=FEDORA-2026-58f458e24e

Ubuntu 20.04 · apache2 · FIXED · 2.4.41-4ubuntu3.19

sudo apt update && sudo apt install --only-upgrade apache2 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' apache2)" ge "2.4.41-4ubuntu3.19" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 22.04 · apache2 · FIXED · 2.4.52-1ubuntu4.10

sudo apt update && sudo apt install --only-upgrade apache2 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' apache2)" ge "2.4.52-1ubuntu4.10" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 24.04 · apache2 · FIXED · 2.4.58-1ubuntu8.2

sudo apt update && sudo apt install --only-upgrade apache2 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' apache2)" ge "2.4.58-1ubuntu8.2" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 24.10 · 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

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

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: p0in7s/CVE-2024-38475 (17 stars)
GitHub PoC: soltanali0/CVE-2024-38475 (5 stars)
GitHub PoC: abrewer251/CVE-2024-38475_SonicBoom_Apache_URL_Traversal_PoC (0 stars)
Nuclei scan template: Sonicwall - Pre-Authentication Arbitrary File Read

Verify at the official source NVD · CVE Program · CISA KEV catalog · 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-2024-38475?

http server: upgrade to 2.4.60; ontap 9: mitigate or apply the listed mitigation; sma 200 firmware: upgrade to 10.2.1.14-75sv. Exact commands for each OS are on this page.

Is CVE-2024-38475 being exploited?

Yes. CVE-2024-38475 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

What does CVE-2024-38475 affect?

CVE-2024-38475 affects http server, ontap 9, sma 200 firmware. Severity is critical (CVSS 9.1). Improper escaping of output in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attacker to map URLs to filesystem locations that are permitted to be served by the server but are not intentionally/directly reachable by any URL

How urgent is CVE-2024-38475?

Priority 100/100. Critical severity; EPSS top 1%: very likely to be exploited; Exploited in the wild (CISA KEV); Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Apache HTTP Server vulnerabilities · SonicWall vulnerabilities

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References

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