CVE-2024-39936

An issue was discovered in HTTP2 in Qt before 5.15.18, 6.x before 6.2.13, 6.3.x through 6.5.x before 6.5.7, and 6.6.x through 6.7.x before 6.7.3. Code to make security-relevant decisions about an established connection may execute too early, because the encrypted() signal has not yet been emitted and processed..

Published: 2024-07-04 Last update: 2025-11-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-39936 is rated Moderate Risk (47.2/100): CVSS High severity, with low exploitation likelihood (EPSS 0.15%). 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-2024-39936

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 2025-08-12 0.08% 0.15% +0.07%
2 2025-03-30 0.23% 0.08% -0.15%
3 2025-03-29 — 0.23% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-39936

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.6 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N 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:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
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:N)
Service keeps running; no real outage angle.
 3.9 4.0 [email protected]
5.9 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N 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:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
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:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.2 3.6 [email protected]

Weakness enumeration for CVE-2024-39936

OS Trackers for CVE-2024-39936

vendor priority summary link
alpine high CVE-2024-39936: 1 source package rows (qt6-qtbase); 3 state rows across 3 repos (3.21-community, 3.22-community, edge-community); fixed 3, open 0. https://security.alpinelinux.org/vuln/CVE-2024-39936
debian unimportant CVE-2024-39936 unimportant priority: Debian including 3 source packages (qt6-base, qtbase-opensource-src, qtbase-opensource-src-gles), 14 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 8, open 6. https://security-tracker.debian.org/tracker/CVE-2024-39936
gentoo high CVE-2024-39936: 1 GLSA(s) (202506-06), 3 atom(s) (dev-qt/qtbase, dev-qt/qtgui, dev-qt/qtnetwork); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2024-39936
redhat high — https://access.redhat.com/security/cve/CVE-2024-39936
suse high CVE-2024-39936 severity important: SUSE including 886 source package names (0.3.2-1.2:libQt5Core5-5.15.12+kde151-150600.3.6.1, 0.3.2-1.2:libQt5DBus5-5.15.12+kde151-150600.3.6.1, …), 2237 product×package rows across 112 product lines (Container containers/lmcache-vllm-openai, Container containers/open-webui, … (112 product lines)): Fixed 1866, Known Affected 231, Known Not Affected 140. https://www.suse.com/security/cve/CVE-2024-39936/
ubuntu medium CVE-2024-39936 medium priority: Ubuntu including 1 source packages (qtbase-opensource-src), 10 status rows across 10 suites (bionic, focal, jammy, mantic, noble, oracular, plucky, questing, upstream, xenial): not-affected 4, released 4, ignored 2. https://ubuntu.com/security/CVE-2024-39936

Affected software / configurations for CVE-2024-39936

Vendor Product Version Raw CPE
qt qt < 5.15.18 cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*
qt qt >= 6.0.0, < 6.2.13 cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*
qt qt >= 6.3.0, < 6.5.7 cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*
qt qt >= 6.6.0, < 6.7.3 cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*

References for CVE-2024-39936

cvelogic Threat Intelligence