CVE-2007-4137

Off-by-one error in the QUtf8Decoder::toUnicode function in Trolltech Qt 3 allows context-dependent attackers to cause a denial of service (crash) via a crafted Unicode string that triggers a heap-based buffer overflow. NOTE: Qt 4 has the same error in the QUtf8Codec::convertToUnicode function, but it is not exploitable.

Published: 2007-09-18 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2007-4137 is rated Moderate Risk (58.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.34%). 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-2007-4137

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 2026-06-18 2.36% 2.34% -0.02%
2 2026-06-15 3.69% 2.36% -1.33%
3 2026-05-07 — 3.69% —

Full EPSS history (21 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2007-4137

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2007-4137

OS Trackers for CVE-2007-4137

vendor priority summary link
gentoo normal CVE-2007-4137: 1 GLSA(s) (200710-28), 1 atom(s) (x11-libs/qt); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2007-4137
redhat high — https://access.redhat.com/security/cve/CVE-2007-4137
ubuntu medium CVE-2007-4137 medium priority: Ubuntu including 2 source packages (qt-x11-free, qt4-x11), 8 status rows across 4 suites (dapper, edgy, feisty, upstream): released 5, ignored 3. https://ubuntu.com/security/CVE-2007-4137

Affected software / configurations for CVE-2007-4137

Vendor Product Version Raw CPE
trolltech qt 3.0 cpe:2.3:a:trolltech:qt:3.0:*:*:*:*:*:*:*
trolltech qt 3.0.3 cpe:2.3:a:trolltech:qt:3.0.3:*:*:*:*:*:*:*
trolltech qt 3.0.5 cpe:2.3:a:trolltech:qt:3.0.5:*:*:*:*:*:*:*
trolltech qt 3.1 cpe:2.3:a:trolltech:qt:3.1:*:*:*:*:*:*:*
trolltech qt 3.1.1 cpe:2.3:a:trolltech:qt:3.1.1:*:*:*:*:*:*:*
trolltech qt 3.1.2 cpe:2.3:a:trolltech:qt:3.1.2:*:*:*:*:*:*:*
trolltech qt 3.2.1 cpe:2.3:a:trolltech:qt:3.2.1:*:*:*:*:*:*:*
trolltech qt 3.2.3 cpe:2.3:a:trolltech:qt:3.2.3:*:*:*:*:*:*:*
trolltech qt 3.3.0 cpe:2.3:a:trolltech:qt:3.3.0:*:*:*:*:*:*:*
trolltech qt 3.3.1 cpe:2.3:a:trolltech:qt:3.3.1:*:*:*:*:*:*:*
trolltech qt 3.3.2 cpe:2.3:a:trolltech:qt:3.3.2:*:*:*:*:*:*:*
trolltech qt 3.3.3 cpe:2.3:a:trolltech:qt:3.3.3:*:*:*:*:*:*:*
trolltech qt 3.3.4 cpe:2.3:a:trolltech:qt:3.3.4:*:*:*:*:*:*:*
trolltech qt 3.3.5 cpe:2.3:a:trolltech:qt:3.3.5:*:*:*:*:*:*:*
trolltech qt 3.3.6 cpe:2.3:a:trolltech:qt:3.3.6:*:*:*:*:*:*:*
trolltech qt 3.3.7 cpe:2.3:a:trolltech:qt:3.3.7:*:*:*:*:*:*:*
trolltech qt 3.3.8 cpe:2.3:a:trolltech:qt:3.3.8:*:*:*:*:*:*:*
trolltech qt 4.1 cpe:2.3:a:trolltech:qt:4.1:*:*:*:*:*:*:*
trolltech qt 4.1.4 cpe:2.3:a:trolltech:qt:4.1.4:*:*:*:*:*:*:*
trolltech qt 4.1.5 cpe:2.3:a:trolltech:qt:4.1.5:*:*:*:*:*:*:*
trolltech qt 4.2 cpe:2.3:a:trolltech:qt:4.2:*:*:*:*:*:*:*
trolltech qt 4.2.1 cpe:2.3:a:trolltech:qt:4.2.1:*:*:*:*:*:*:*
trolltech qt 4.2.3 cpe:2.3:a:trolltech:qt:4.2.3:*:*:*:*:*:*:*

References for CVE-2007-4137

URL Tags
ftp://patches.sgi.com/support/free/security/advisories/20070901-01-P.asc
http://bugs.gentoo.org/show_bug.cgi?id=192472
http://dist.trolltech.com/developer/download/175791_3.diff
http://dist.trolltech.com/developer/download/175791_4.diff
http://fedoranews.org/updates/FEDORA-2007-221.shtml
http://fedoranews.org/updates/FEDORA-2007-703.shtml
http://osvdb.org/39384
http://secunia.com/advisories/26778 Vendor Advisory
http://secunia.com/advisories/26782 Vendor Advisory
http://secunia.com/advisories/26804
http://secunia.com/advisories/26811 Vendor Advisory
http://secunia.com/advisories/26857
http://secunia.com/advisories/26868
http://secunia.com/advisories/26882
http://secunia.com/advisories/26987
http://secunia.com/advisories/27053
http://secunia.com/advisories/27275
http://secunia.com/advisories/27382
http://secunia.com/advisories/27996
http://secunia.com/advisories/28021
http://security.gentoo.org/glsa/glsa-200710-28.xml
http://security.gentoo.org/glsa/glsa-200712-08.xml
http://securitytracker.com/id?1018688
http://support.avaya.com/elmodocs2/security/ASA-2007-424.htm
http://trolltech.com/company/newsroom/announcements/press.2007-09-03.7564032119
http://www.debian.org/security/2007/dsa-1426
http://www.mandriva.com/security/advisories?name=MDKSA-2007:183
http://www.novell.com/linux/security/advisories/2007_19_sr.html
http://www.redhat.com/support/errata/RHSA-2007-0883.html
http://www.securityfocus.com/archive/1/481498/100/0/threaded
http://www.securityfocus.com/bid/25657
http://www.ubuntu.com/usn/usn-513-1
http://www.vupen.com/english/advisories/2007/3144
https://bugzilla.redhat.com/show_bug.cgi?id=269001
https://issues.rpath.com/browse/RPL-1751
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11159
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