CVE-2021-34335Public exploit

Utility crash via unchecked lens-data denominator

Published Aug 9, 2021 · Updated Aug 4, 2024

Divide by zero in Exiv2 0.27.4 and earlier allows local users to crash the utility by processing a crafted image's metadata. Exiv2::Internal::resolveLens0xffff in src/minoltamn_int.cpp divides lens metadata by a denominator without first requiring it to be positive. The crash occurs only when a user invokes interpreted metadata output with -p t or -P t, so ordinary metadata printing does not reach the faulty operation.

CVSS severity4.7
Medium
EPSS probability0.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Divide by zero in Exiv2 0.27.4 and earlier allows local users to crash the utility by processing a crafted image's metadata. Exiv2::Internal::resolveLens0xffff in src/minoltamn_int.cpp divides lens metadata by a denominator without first requiring it to be positive. The crash occurs only when a user invokes interpreted metadata output with -p t or -P t, so ordinary metadata printing does not reach the faulty operation.

The record

CVE
CVE-2021-34335
Published
Aug 9, 2021
Updated
Aug 4, 2024
Vendor
Exiv2
Product
Exiv2
Classifications
CWE-369, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 9, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 0.27.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Exiv2 · Exiv2version=<= 0.27.4

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.7GitHub, Inc.CVSS:3.1/AV:L/AC:H/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-369Divide By Zero
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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