CVE-2024-36387 | Apache HTTP Server: DoS by Null pointer in websocket over HTTP/2

Serving WebSocket protocol upgrades over a HTTP/2 connection could result in a Null Pointer dereference, leading to a crash of the server process, degrading performance.

Published: 2024-07-01 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-36387 is rated Moderate Risk (49.2/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.71%). EPSS rose +1.53% over the last day, indicating growing attacker interest. 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-2024-36387

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 2026-06-15 0.19% 1.71% +1.53%
2 2026-04-14 0.14% 0.19% +0.05%
3 2026-01-30 — 0.14% —

Full EPSS history (22 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-36387

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.4 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L 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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 2.8 2.5 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2024-36387

OS Trackers for CVE-2024-36387

vendor priority summary link
alpine — CVE-2024-36387: 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-2024-36387
debian not yet assigned CVE-2024-36387 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-2024-36387
gentoo low CVE-2024-36387: 1 GLSA(s) (202409-31), 1 atom(s) (www-servers/apache); latest impact low. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2024-36387
redhat low — https://access.redhat.com/security/cve/CVE-2024-36387
suse medium CVE-2024-36387 severity moderate: SUSE including 34 source package names (2.8:apache2-utils-2.4.58-150600.5.18.1, 5.0.1.7.5.1:apache2-2.4.58-150600.5.18.1, …), 191 product×package rows across 51 product lines (Container bci/php-apache, Container suse/manager/5.0/x86_64/proxy-httpd, … (51 product lines)): Known Not Affected 141, Fixed 50. https://www.suse.com/security/cve/CVE-2024-36387/
ubuntu medium CVE-2024-36387 medium priority: Ubuntu including 1 source packages (apache2), 9 status rows across 9 suites (bionic, focal, jammy, mantic, noble, oracular, trusty, upstream, xenial): released 6, not-affected 3. https://ubuntu.com/security/CVE-2024-36387

Affected software / configurations for CVE-2024-36387

Vendor Product Version Raw CPE
apache http_server >= 2.4.55, <= 2.4.59 cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
netapp ontap 9 cpe:2.3:a:netapp:ontap:9:*:*:*:*:*:*:*

References for CVE-2024-36387

cvelogic Threat Intelligence