CVE-2023-51714

An issue was discovered in the HTTP2 implementation in Qt before 5.15.17, 6.x before 6.2.11, 6.3.x through 6.5.x before 6.5.4, and 6.6.x before 6.6.2. network/access/http2/hpacktable.cpp has an incorrect HPack integer overflow check.

Published: 2023-12-24 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-51714 is rated Moderate Risk (60.2/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.99%). 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-2023-51714

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% 0.99% +0.80%
2 2026-06-08 0.14% 0.19% +0.05%
3 2025-11-21 — 0.14% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-51714

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]

Weakness enumeration for CVE-2023-51714

OS Trackers for CVE-2023-51714

vendor priority summary link
debian not yet assigned CVE-2023-51714 not yet assigned 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 11, open 3. https://security-tracker.debian.org/tracker/CVE-2023-51714
gentoo high CVE-2023-51714: 1 GLSA(s) (202402-21), 2 atom(s) (dev-qt/qtbase, dev-qt/qtnetwork); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2023-51714
redhat medium — https://access.redhat.com/security/cve/CVE-2023-51714
suse medium CVE-2023-51714 severity moderate: SUSE including 923 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 2634 product×package rows across 98 product lines (Container suse/sl-micro/6.0/toolbox, Image SLE-Micro, … (98 product lines)): Fixed 1364, Known Not Affected 1039, Known Affected 231. https://www.suse.com/security/cve/CVE-2023-51714/
ubuntu medium CVE-2023-51714 medium priority: Ubuntu including 3 source packages (qt6-base, qtbase-opensource-src, qtbase-opensource-src-gles), 36 status rows across 12 suites (bionic, focal, jammy, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): ignored 17, not-affected 10, released 4, needs-triage 3, DNE 1, needed 1. https://ubuntu.com/security/CVE-2023-51714

Affected software / configurations for CVE-2023-51714

Vendor Product Version Raw CPE
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
qt qt >= 5.7, < 5.15.17 cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*
qt qt >= 6.0.0, < 6.2.11 cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*
qt qt >= 6.3.0, < 6.5.4 cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*
qt qt >= 6.6.0, < 6.6.2 cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*

References for CVE-2023-51714

cvelogic Threat Intelligence