CVE-2021-26805Public exploit

Application crash via out-of-bounds VC-1 header read

Published Apr 14, 2021 · Updated Aug 3, 2024

Heap buffer overflow in tsMuxer 2.6.16 allows local users to crash the application by opening a crafted WAV file. During stream detection, BitStreamReader::getCurVal reads one byte beyond a one-byte heap buffer while VC1SequenceHeader::decode_entry_point parses the crafted input. Exploitation requires a local user to run tsMuxer against the file and results in process termination rather than reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in tsMuxer 2.6.16 allows local users to crash the application by opening a crafted WAV file. During stream detection, BitStreamReader::getCurVal reads one byte beyond a one-byte heap buffer while VC1SequenceHeader::decode_entry_point parses the crafted input. Exploitation requires a local user to run tsMuxer against the file and results in process termination rather than reported data disclosure or modification.

The record

CVE
CVE-2021-26805
Published
Apr 14, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 14, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.3NIST NVDAV: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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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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