CVE-2024-33763Public exploitNetwork attack vector

Application crash via oversized memset in glyph rasterization

Published May 1, 2024 · Updated Oct 25, 2024

Stack buffer underflow in LunaSVG 2.3.9 and earlier allows remote attackers to crash applications that render a crafted SVG file. During LayoutSymbol rendering, gray_convert_glyph passes a crafted size to memset, which writes 3,511,724,192 bytes below the stack buffer. Exploitation requires an application to render attacker-controlled SVG content and terminates the affected process, with no demonstrated data disclosure or code execution.

CVSS severity7.5
High
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer underflow in LunaSVG 2.3.9 and earlier allows remote attackers to crash applications that render a crafted SVG file. During LayoutSymbol rendering, gray_convert_glyph passes a crafted size to memset, which writes 3,511,724,192 bytes below the stack buffer. Exploitation requires an application to render attacker-controlled SVG content and terminates the affected process, with no demonstrated data disclosure or code execution.

The record

CVE
CVE-2024-33763
Published
May 1, 2024
Updated
Oct 25, 2024
Vendor
Samuel Ugochukwu
Product
LunaSVG
Classifications
CWE-125, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 1, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 25, 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 <=2.3.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Samuel Ugochukwu · LunaSVGversion=0 <=2.3.9

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 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

CWE-125Out-of-bounds Read
T1499Endpoint Denial of Service

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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