Is CVE-2021-21848 in the CISA KEV catalog?

No. CVE-2021-21848 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-21848?

CVE-2021-21848 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2021-21848?

CVE-2021-21848 has an EPSS score of 1.70% (74th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-21848?

Upgrade gpac on debian 11 to 1.0.1+dfsg1-4+deb11u1 or later.

CVE & CISA-KEV Catalog

CVE-2021-21848

HIGHEPSS 74th pctl

8.8

CVSS v3

NVD

Description

An exploitable integer overflow vulnerability exists within the MPEG-4 decoding functionality of the GPAC Project on Advanced Content library v1.0.1. The library will actually reuse the parser for atoms with the “stsz” FOURCC code when parsing atoms that use the “stz2” FOURCC code and can cause an integer overflow due to unchecked arithmetic resulting in a heap-based buffer overflow that causes memory corruption. An attacker can convince a user to open a video to trigger this vulnerability.

CWE-680 CWE-119Buffer Overflow

How to fix

Remediation Available

gpacDebian

Fixed in:1.0.1+dfsg1-4+deb11u1CVE-2021-21848

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploit Intelligence

1.70%probability of exploitation in 30 days

74thpercentile

Elevated risk: more likely to be exploited than 74% of all known CVEs.

References

Exploit1

talosintelligence.com

Third-Party Advisory1

debian.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.