CVE-2020-18775Network attack vector

Process denial of service via heap over-read

Published Aug 23, 2021 · Updated Aug 4, 2024

Heap-based buffer over-read in Libav 12.3 allows remote attackers to interrupt a decoding process through a crafted VC-1 media file. The vc1_decode_b_mb_intfi routine in vc1_block.c reads beyond an allocated heap buffer while decoding attacker-controlled file data. Exploitation requires the file to be processed; published sources report no confidentiality or integrity impact and do not identify whether the interruption is a crash or hang.

CVSS severity6.5
Medium
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer over-read in Libav 12.3 allows remote attackers to interrupt a decoding process through a crafted VC-1 media file. The vc1_decode_b_mb_intfi routine in vc1_block.c reads beyond an allocated heap buffer while decoding attacker-controlled file data. Exploitation requires the file to be processed; published sources report no confidentiality or integrity impact and do not identify whether the interruption is a crash or hang.

The record

CVE
CVE-2020-18775
Published
Aug 23, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-126, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 23, 2021CVE 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
6.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-126Buffer Over-read
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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