CVE-2021-36409Public exploit

Application crash via malformed scaling-list delta

Published Jan 10, 2022 · Updated Aug 4, 2024

Reachable assertion in libde265 1.0.8 allows context-dependent attackers to crash a decoding application with a crafted H.265 file. When sizeId is 3, read_scaling_list accepts a scaling_list_pred_matrix_id_delta other than 1 and reaches an assertion instead of rejecting the malformed sequence parameter set. Exploitation requires the crafted file to be decoded, and the demonstrated consequence is a SIGABRT process crash rather than code execution or data access.

CVSS severity7.8
High
EPSS probability0.90%
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 libde265 1.0.8 allows context-dependent attackers to crash a decoding application with a crafted H.265 file. When sizeId is 3, read_scaling_list accepts a scaling_list_pred_matrix_id_delta other than 1 and reaches an assertion instead of rejecting the malformed sequence parameter set. Exploitation requires the crafted file to be decoded, and the demonstrated consequence is a SIGABRT process crash rather than code execution or data access.

The record

CVE
CVE-2021-36409
Published
Jan 10, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-617, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 10, 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

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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

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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