CVE-2021-31292Public exploitNetwork attack vector

Service crash via wrapped metadata copy length

Published Jul 26, 2021 · Updated Aug 3, 2024

Integer overflow in CrwMap::encode0x1810 in Exiv2 0.27.3 allows attackers to crash metadata processing via crafted metadata. When the metadata buffer is shorter than 28 bytes, the function subtracts 8 from its unsigned size and passes the wrapped length to memcpy, causing an out-of-bounds heap read. Triggering the flaw requires Exiv2 to insert crafted metadata into an image; the demonstrated consequence is process termination under AddressSanitizer.

CVSS severity7.5
High
EPSS probability2.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in CrwMap::encode0x1810 in Exiv2 0.27.3 allows attackers to crash metadata processing via crafted metadata. When the metadata buffer is shorter than 28 bytes, the function subtracts 8 from its unsigned size and passes the wrapped length to memcpy, causing an out-of-bounds heap read. Triggering the flaw requires Exiv2 to insert crafted metadata into an image; the demonstrated consequence is process termination under AddressSanitizer.

The record

CVE
CVE-2021-31292
Published
Jul 26, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 26, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5SUSECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0SUSEAV:N/AC:L/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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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