CVE-2021-33815

HIGHNVD 8.88.8—

8.8

dwa_uncompress in libavcodec/exr.c in FFmpeg 4.4 allows an out-of-bounds array access because dc_count is not strictly checked.

CVSS v3: 8.8
EG Score: 8.8(medium)
EPSS: 30.4%
KEV: Not listed

Published

June 3, 2021

Last Modified

November 21, 2024

References (4)

cve@mitrehttps://github.com/FFmpeg/FFmpeg/commit/26d3c81bc5ef2f8c3f09d45eaeacfb4b1139a777
cve@mitrehttps://security.gentoo.org/glsa/202312-14
af854a3a-2127-422b-91ae-364da2661108https://github.com/FFmpeg/FFmpeg/commit/26d3c81bc5ef2f8c3f09d45eaeacfb4b1139a777
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202312-14

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-129Improper Validation of Array Index

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
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2026-06-01 13:50 UTCepss_batch
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2026-05-27 13:39 UTCepss_batch
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2026-05-26 15:32 UTCEG score recompute
2026-05-26 15:32 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2021-33815?

CVE-2021-33815 is a high vulnerability published on June 3, 2021. dwauncompress in libavcodec/exr.c in FFmpeg 4.4 allows an out-of-bounds array access because dccount is not strictly checked.

When was CVE-2021-33815 disclosed?

CVE-2021-33815 was first published in the National Vulnerability Database on June 3, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-33815 actively exploited?

CVE-2021-33815 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 30.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-33815?

CVE-2021-33815 has a CVSS v3 base score of 8.8 (NVD).

How do I remediate CVE-2021-33815?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-33815, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2021-33815

📅 Published

🔄 Last Modified

🔗 References (4)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-33815?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (4)

Frequently asked(5)

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