CVE-2023-33802Public exploit

Application crash via failed text-buffer allocation

Published Jul 26, 2023 · Updated Oct 23, 2024

Buffer overflow in SumatraPDF Reader 3.4.6 allows attackers to crash the 32-bit application by opening two crafted text files. The EnsureCap function handles a failed allocation or reallocation by calling CrashAlwaysIf, which writes through a null pointer in CrashMe. A user must open both crafted files in the 32-bit Windows build; the documented consequence is a process crash, not code execution.

CVSS severity5.5
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in SumatraPDF Reader 3.4.6 allows attackers to crash the 32-bit application by opening two crafted text files. The EnsureCap function handles a failed allocation or reallocation by calling CrashAlwaysIf, which writes through a null pointer in CrashMe. A user must open both crafted files in the 32-bit Windows build; the documented consequence is a process crash, not code execution.

The record

CVE
CVE-2023-33802
Published
Jul 26, 2023
Updated
Oct 23, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 26, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 23, 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 vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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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