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CVE Record

CVE-2021-45930: Qt SVG in Qt 5.0.0 through 5.15.2 and 6.0.0 through 6.2.1 has an out-of-bounds write in QtPrivate::QCommonA...

Qt SVG in Qt 5.0.0 through 5.15.2 and 6.0.0 through 6.2.1 has an out-of-bounds write in QtPrivate::QCommonArrayOps<QPainterPath::Element>::growAppend (called from QPainterPath::addPath and QPathClipper::intersect).

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-45930 is a memory corruption flaw in Qt SVG. Software built with affected Qt versions may write outside allocated memory while processing SVG content. The strongest business concern is applications that open or render SVG files from users, email, web content, or other untrusted sources.

Executive priority

Treat this as a targeted remediation item, highest for products or systems that render externally supplied SVGs. It does not justify emergency response based on the supplied evidence, but affected internet-facing or user-content workflows should be updated promptly.

Technical view

The issue is an out-of-bounds write in QtPrivate::QCommonArrayOps<QPainterPath::Element>::growAppend, reached through QPainterPath::addPath and QPathClipper::intersect in Qt SVG. The CVE description names Qt 5.0.0 through 5.15.2 and Qt 6.0.0 through 6.2.1 as affected. Qt commits and Debian/Fedora advisories indicate fixes were released.

Likely exposure

Exposure is most likely in desktop, server, or embedded applications using Qt SVG to parse or render SVG files, especially where SVG input is user-supplied or externally sourced. Linux distributions shipping qtsvg-opensource-src or qt4-x11 packages may also have been affected before their security updates.

Exploitation context

The provided sources do not show active exploitation, and CISA KEV status is false. OSS-Fuzz references indicate the flaw was found through fuzzing. Public evidence supports memory corruption risk during SVG handling, but the bundle does not establish real-world exploitation or a complete exploitability assessment.

Researcher notes

The source bundle lacks CVSS, CWE, and detailed exploitability analysis. Analysis should stay anchored to the named out-of-bounds write path and fuzzing-origin references. Avoid assuming code execution, active exploitation, or affected products beyond Qt SVG and downstream packages named in advisories.

Mitigation direction

  • Apply vendor or distribution security updates for Qt SVG, qtsvg-opensource-src, or qt4-x11.
  • Update embedded Qt dependencies beyond the affected version ranges where vendor guidance confirms a fix.
  • Reduce exposure by limiting untrusted SVG processing until affected Qt components are updated.
  • Check Qt commit references and downstream advisories for the exact patched package versions.

Validation and detection

  • Inventory applications and packages using Qt SVG or Qt qtsvg libraries.
  • Confirm whether versions fall within Qt 5.0.0-5.15.2 or 6.0.0-6.2.1.
  • Prioritize systems that render SVG from users, email, uploads, or web-accessible workflows.
  • Verify Debian, Fedora, or vendor package update status against local package versions.
Prepared
Confidence
medium
Sources
10

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
13Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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