How severe is CVE-2014-5271?

CVE-2014-5271 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2014-5271 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2014-5271?

CVE-2014-5271 primarily affects Ffmpeg. In total, 79 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2014-5271?

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-2014-5271 published?

CVE-2014-5271 was published on 2014-11-03 and last updated on 2026-06-17.

CVE-2014-5271

CVE-2014-5271 is a high-severity vulnerability in Ffmpeg 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: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Ffmpeg
Published: 2014-11-03
Last modified: 2026-06-17

Description

Heap-based buffer overflow in the encode_slice function in libavcodec/proresenc_kostya.c in FFMpeg before 1.1.14, 1.2.x before 1.2.8, 2.x before 2.2.7, and 2.3.x before 2.3.3 and Libav before 10.5 allows remote attackers to cause a denial of service (crash) or possibly execute arbitrary code via unspecified vectors.

Frequently asked questions

What is CVE-2014-5271?: Heap-based buffer overflow in the encode_slice function in libavcodec/proresenc_kostya.c in FFMpeg before 1.1.14, 1.2.x before 1.2.8, 2.x before 2.2.7, and 2.3.x before 2.3.3 and Libav before 10.5 allows remote attackers to cause a denial of service (crash) or possibly execute arbitrary code via unspecified vectors.
How severe is CVE-2014-5271?: CVE-2014-5271 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2014-5271 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2014-5271?: CVE-2014-5271 primarily affects Ffmpeg. In total, 79 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2014-5271?: 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-2014-5271 published?: CVE-2014-5271 was published on 2014-11-03 and last updated on 2026-06-17.

References

Affected products (79)

cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:1.1:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:1.1.1:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:1.1.2:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:1.1.3:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:1.1.4:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:1.1.5:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:1.1.6:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:1.1.7:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:1.1.8:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:1.1.9:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:1.1.10:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:1.1.11:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:1.1.12:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:1.2:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:1.2.1:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:1.2.3:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:1.2.4:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:1.2.5:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:1.2.6:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:1.2.7:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:2.0:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:2.0.1:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:2.0.2:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:2.0.3:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:2.0.4:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:2.0.5:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:2.1:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:2.1.1:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:2.1.2:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:2.1.3:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:2.1.4:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:2.1.5:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:2.2:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:2.2.4:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:2.3:*:*:*:*:*:*:*
cpe:2.3:a:ffmpeg:ffmpeg:2.3.2:*:*:*:*:*:*:*
cpe:2.3:a:libav:libav:*:*:*:*:*:*:*:*
cpe:2.3:a:libav:libav:0.5:*:*:*:*:*:*:*
cpe:2.3:a:libav:libav:0.5.1:*:*:*:*:*:*:*

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