CVE-2020-23877Public exploitNetwork attack vector

Converter crash via malformed PDF object stream

Published Nov 10, 2021 · Updated Aug 4, 2024

Stack buffer overflow in pdf2xml 2.0 allows attackers to crash the converter when it processes a crafted PDF object stream. The getObjectStream routine mishandles malformed object-stream data and writes beyond a stack buffer, although the exact unchecked field or copy operation is undisclosed. The published proof of concept triggers SIGSEGV during command-line conversion, demonstrating a service interrupt but not code execution.

CVSS severity9.8
Critical
EPSS probability1.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in pdf2xml 2.0 allows attackers to crash the converter when it processes a crafted PDF object stream. The getObjectStream routine mishandles malformed object-stream data and writes beyond a stack buffer, although the exact unchecked field or copy operation is undisclosed. The published proof of concept triggers SIGSEGV during command-line conversion, demonstrating a service interrupt but not code execution.

The record

CVE
CVE-2020-23877
Published
Nov 10, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 10, 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

7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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-787Out-of-bounds Write

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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