How severe is CVE-2007-4137?

CVE-2007-4137 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2007-4137 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-4137?

CVE-2007-4137 primarily affects Trolltech Qt. In total, 23 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2007-4137?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2007-4137 published?

CVE-2007-4137 was published on 2007-09-18 and last updated on 2026-06-16.

CVE-2007-4137

CVE-2007-4137 is a high-severity vulnerability in Trolltech Qt with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Trolltech Qt
Published: 2007-09-18
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2007-4137?: CVE-2007-4137 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2007-4137 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2007-4137?: CVE-2007-4137 primarily affects Trolltech Qt. In total, 23 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2007-4137?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2007-4137 published?: CVE-2007-4137 was published on 2007-09-18 and last updated on 2026-06-16.

References

Affected products (23)

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

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