CVE-2024-38473 | Apache HTTP Server proxy encoding problem

Encoding problem in mod_proxy in Apache HTTP Server 2.4.59 and earlier allows request URLs with incorrect encoding to be sent to backend services, potentially bypassing authentication via crafted requests. Users are recommended to upgrade to version 2.4.60, which fixes this issue.

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

CVE-2024-38473 is rated High Risk (67.7/100): CVSS High severity, with high exploitation likelihood (EPSS 88.36%, 100th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize 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-2024-38473

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 2026-04-27 87.86% 88.36% +0.50%
2 2026-04-21 88.26% 87.86% -0.40%
3 2026-03-11 — 88.26% —

Full EPSS history (51 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-38473

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.1 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/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:L)
A normal user session is enough; they don’t have to be admin.
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:H)
Serious risk that confidential data gets exposed in a big 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.
 2.8 5.2 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2024-38473

OS Trackers for CVE-2024-38473

vendor priority summary link
alpine — CVE-2024-38473: 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-2024-38473
debian not yet assigned CVE-2024-38473 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-2024-38473
gentoo low CVE-2024-38473: 1 GLSA(s) (202409-31), 1 atom(s) (www-servers/apache); latest impact low. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2024-38473
redhat medium — https://access.redhat.com/security/cve/CVE-2024-38473
suse medium CVE-2024-38473 severity moderate: SUSE including 316 source package names (2.8:apache2-utils-2.4.58-150600.5.23.1, 4.3.13.9.57.26:apache2-2.4.51-150400.6.34.1, …), 533 product×package rows across 77 product lines (Container bci/php-apache, Container suse/manager/4.3/proxy-httpd, … (77 product lines)): Fixed 301, Known Affected 231, Known Not Affected 1. https://www.suse.com/security/cve/CVE-2024-38473/
ubuntu medium CVE-2024-38473 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 8, needs-triage 3. https://ubuntu.com/security/CVE-2024-38473

Affected software / configurations for CVE-2024-38473

Vendor Product Version Raw CPE
apache http_server >= 2.4.0, < 2.4.60 cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
netapp ontap 9 cpe:2.3:a:netapp:ontap:9:*:*:*:*:*:*:*

References for CVE-2024-38473

cvelogic Threat Intelligence