CVE-2021-45481Network attack vector

Application crash via incorrect image-buffer allocation

Published Dec 25, 2021 · Updated Aug 4, 2024

Denial of service in WebKitGTK and WPE WebKit before 2.34.0 allows remote attackers to crash applications via crafted web content. WebCore::ImageBufferCairoImageSurfaceBackend::create allocates memory incorrectly while creating a Cairo-backed image buffer, causing a segmentation violation. A user must load attacker-controlled web content; the demonstrated consequence is an application crash without reported code execution or data exposure.

CVSS severity6.5
Medium
EPSS probability1.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in WebKitGTK and WPE WebKit before 2.34.0 allows remote attackers to crash applications via crafted web content. WebCore::ImageBufferCairoImageSurfaceBackend::create allocates memory incorrectly while creating a Cairo-backed image buffer, causing a segmentation violation. A user must load attacker-controlled web content; the demonstrated consequence is an application crash without reported code execution or data exposure.

The record

CVE
CVE-2021-45481
Published
Dec 25, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-401, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 25, 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

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

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499.004Application 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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