CVE-2021-45861Public exploit

Application crash via oversized VVC reserved-bit count

Published Mar 1, 2022 · Updated Aug 4, 2024

Reachable assertion in tsMuxer git-c6a0277 allows local users to crash the application by opening a crafted VVC media file. VvcUnitWithProfile::profile_tier_level passes a gci_num_reserved_bits value greater than 32 to BitStreamReader::skipBits, whose assertion requires num to fit within INT_BIT. Processing attacker-supplied input is required, and the resulting SIGABRT interrupts the active tsMuxer process.

CVSS severity5.5
Medium
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in tsMuxer git-c6a0277 allows local users to crash the application by opening a crafted VVC media file. VvcUnitWithProfile::profile_tier_level passes a gci_num_reserved_bits value greater than 32 to BitStreamReader::skipBits, whose assertion requires num to fit within INT_BIT. Processing attacker-supplied input is required, and the resulting SIGABRT interrupts the active tsMuxer process.

The record

CVE
CVE-2021-45861
Published
Mar 1, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-617, T1499.004, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 1, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.3NVDAV:N/AC:M/Au:N/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Endpoint Denial of Service: Application or System Exploitation
T1204.002User Execution: Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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