CVE-2021-45385Public exploitNetwork attack vector

Encoder crash via out-of-range BMP dimensions

Published Feb 11, 2022 · Updated Aug 4, 2024

Null pointer dereference in ffjpeg d5cfd49 allows attackers to crash the encoder by supplying a BMP file with out-of-range size metadata. bmp_load returns without allocating pb->pdata when the dimensions are out of range, and jfif_encode later dereferences that null buffer. Exploitation requires ffjpeg to encode the crafted BMP and interrupts only that process.

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

Null pointer dereference in ffjpeg d5cfd49 allows attackers to crash the encoder by supplying a BMP file with out-of-range size metadata. bmp_load returns without allocating pb->pdata when the dimensions are out of range, and jfif_encode later dereferences that null buffer. Exploitation requires ffjpeg to encode the crafted BMP and interrupts only that process.

The record

CVE
CVE-2021-45385
Published
Feb 11, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 11, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
6.5NIST NVDCVSS: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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1204.002Malicious 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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