CVE-2023-27103Public exploitNetwork attack vector

Decoder crash via unchecked slice-header index

Published Mar 15, 2023 · Updated Aug 2, 2024

Heap buffer overflow in libde265 1.0.11 allows context-dependent attackers to crash a decoder via a crafted H.265 bitstream. derive_collocated_motion_vectors uses an index derived from decoded coordinates to read colImg->slices without validating it against the vector bounds. Exploitation requires an application using libde265 to decode attacker-controlled content; the published proof demonstrates an out-of-bounds read and process abort, while code execution remains unproven.

CVSS severity8.8
High
EPSS probability0.85%
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 libde265 1.0.11 allows context-dependent attackers to crash a decoder via a crafted H.265 bitstream. derive_collocated_motion_vectors uses an index derived from decoded coordinates to read colImg->slices without validating it against the vector bounds. Exploitation requires an application using libde265 to decode attacker-controlled content; the published proof demonstrates an out-of-bounds read and process abort, while code execution remains unproven.

The record

CVE
CVE-2023-27103
Published
Mar 15, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 15, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

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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