CVE-2024-38477 | Apache HTTP Server: Crash resulting in Denial of Service in mod_proxy via a malicious request

null pointer dereference in mod_proxy in Apache HTTP Server 2.4.59 and earlier allows an attacker to crash the server via a malicious request. Users are recommended to upgrade to version 2.4.60, which fixes this issue.

Published: 2024-07-01 Last update: 2025-11-03 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-38477 is rated Moderate Risk (59.6/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.92%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2024-38477

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-21 1.51% 1.92% +0.42%
2 2026-04-14 1.15% 1.51% +0.36%
3 2026-04-09 — 1.15% —

Full EPSS history (58 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-38477

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2024-38477

OS Trackers for CVE-2024-38477

vendor priority summary link
alpine — CVE-2024-38477: 1 source package rows (apache2); 7 state rows across 7 repos (3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 7, open 0. https://security.alpinelinux.org/vuln/CVE-2024-38477
debian not yet assigned CVE-2024-38477 not yet assigned priority: Debian including 1 source packages (apache2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2024-38477
gentoo low CVE-2024-38477: 1 GLSA(s) (202409-31), 1 atom(s) (www-servers/apache); latest impact low. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2024-38477
redhat high — https://access.redhat.com/security/cve/CVE-2024-38477
suse high CVE-2024-38477 severity important: SUSE including 323 source package names (2.8:apache2-utils-2.4.58-150600.5.11.1, 4.3.13.9.57.7:apache2-2.4.51-150400.6.29.1, …), 519 product×package rows across 72 product lines (Container bci/php-apache, Container suse/manager/4.3/proxy-httpd, … (72 product lines)): Fixed 288, Known Affected 231. https://www.suse.com/security/cve/CVE-2024-38477/
ubuntu medium CVE-2024-38477 medium priority: Ubuntu including 1 source packages (apache2), 11 status rows across 11 suites (bionic, focal, jammy, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): released 10, needs-triage 1. https://ubuntu.com/security/CVE-2024-38477

Affected software / configurations for CVE-2024-38477

Vendor Product Version Raw CPE
apache http_server >= 2.4.0, < 2.4.60 cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
netapp clustered_data_ontap 9.0 cpe:2.3:o:netapp:clustered_data_ontap:9.0:*:*:*:*:*:*:*

References for CVE-2024-38477

cvelogic Threat Intelligence