CVE-2021-28025

Exp

Integer Overflow vulnerability in qsvghandler.cpp in Qt qtsvg versions 5.15.1, 6.0.0, 6.0.2, and 6.2, allows local attackers to cause a denial of service (DoS).

Published: 2023-08-11 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-28025 is rated Exploit Available (50/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.27%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

Public exploit references (Exploit-DB) for CVE-2021-28025

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2021-28025

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 0.04% 0.27% +0.23%
2 2025-03-30 0.07% 0.04% -0.03%
3 2025-03-29 — 0.07% —

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-28025

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.5 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
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.
 1.8 3.6 [email protected]

Weakness enumeration for CVE-2021-28025

OS Trackers for CVE-2021-28025

vendor priority summary link
debian unimportant CVE-2021-28025 unimportant priority: Debian including 2 source packages (qt6-svg, qtsvg-opensource-src), 9 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 8, open 1. https://security-tracker.debian.org/tracker/CVE-2021-28025
redhat medium — https://access.redhat.com/security/cve/CVE-2021-28025
suse medium CVE-2021-28025 severity moderate: SUSE including 147 source package names (libQt5Bootstrap-devel-static, libQt5Bootstrap-devel-static-32bit, …), 1942 product×package rows across 52 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 7.1, … (52 product lines)): Known Not Affected 1942. https://www.suse.com/security/cve/CVE-2021-28025/
ubuntu medium CVE-2021-28025 medium priority: Ubuntu including 3 source packages (qt4-x11, qt6-svg, qtsvg-opensource-src), 36 status rows across 12 suites (bionic, focal, jammy, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): needs-triage 11, DNE 9, ignored 8, not-affected 7, released 1. https://ubuntu.com/security/CVE-2021-28025

Affected software / configurations for CVE-2021-28025

Vendor Product Version Raw CPE
qt qt 5.15.1 cpe:2.3:a:qt:qt:5.15.1:*:*:*:*:*:*:*
qt qt 6.0.0 cpe:2.3:a:qt:qt:6.0.0:-:*:*:*:*:*:*
qt qt 6.0.0 cpe:2.3:a:qt:qt:6.0.0:alpha1:*:*:*:*:*:*
qt qt 6.0.0 cpe:2.3:a:qt:qt:6.0.0:beta1:*:*:*:*:*:*
qt qt 6.0.0 cpe:2.3:a:qt:qt:6.0.0:beta2:*:*:*:*:*:*
qt qt 6.0.0 cpe:2.3:a:qt:qt:6.0.0:beta3:*:*:*:*:*:*
qt qt 6.0.0 cpe:2.3:a:qt:qt:6.0.0:beta4:*:*:*:*:*:*
qt qt 6.0.0 cpe:2.3:a:qt:qt:6.0.0:beta5:*:*:*:*:*:*
qt qt 6.0.0 cpe:2.3:a:qt:qt:6.0.0:rc1:*:*:*:*:*:*
qt qt 6.0.0 cpe:2.3:a:qt:qt:6.0.0:rc2:*:*:*:*:*:*
qt qt 6.0.2 cpe:2.3:a:qt:qt:6.0.2:*:*:*:*:*:*:*
qt qt 6.2.0 cpe:2.3:a:qt:qt:6.2.0:alpha1:*:*:*:*:*:*
qt qt 6.2.0 cpe:2.3:a:qt:qt:6.2.0:beta1:*:*:*:*:*:*
qt qt 6.2.0 cpe:2.3:a:qt:qt:6.2.0:beta2:*:*:*:*:*:*
qt qt 6.2.0 cpe:2.3:a:qt:qt:6.2.0:beta3:*:*:*:*:*:*
qt qt 6.2.0 cpe:2.3:a:qt:qt:6.2.0:beta4:*:*:*:*:*:*
qt qt 6.2.0 cpe:2.3:a:qt:qt:6.2.0:rc1:*:*:*:*:*:*
qt qt 6.2.0 cpe:2.3:a:qt:qt:6.2.0:rc2:*:*:*:*:*:*

References for CVE-2021-28025

URL Tags
https://bugreports.qt.io/browse/QTBUG-91507 Exploit Issue Tracking Vendor Advisory
cvelogic Threat Intelligence