CVE-2023-2617Public exploitNetwork attack vector

Process crash via malformed QR byte count

Published May 10, 2023 · Updated Jan 27, 2025

Null-pointer dereference in OpenCV WeChat QR Code Module 4.0 through 4.7 allows remote attackers to crash a consuming process via a crafted QR code. When a byte segment declares more bits than remain, DecodedBitStreamParser::decodeByteSegment miscalculates the repaired count and indexes element zero of an empty buffer. Exploitation requires an application to decode the crafted QR code; the established consequence is termination of that process, not data access or code execution.

CVSS severity5.3
Medium
EPSS probability1.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null-pointer dereference in OpenCV WeChat QR Code Module 4.0 through 4.7 allows remote attackers to crash a consuming process via a crafted QR code. When a byte segment declares more bits than remain, DecodedBitStreamParser::decodeByteSegment miscalculates the repaired count and indexes element zero of an empty buffer. Exploitation requires an application to decode the crafted QR code; the established consequence is termination of that process, not data access or code execution.

The record

CVE
CVE-2023-2617
Published
May 10, 2023
Updated
Jan 27, 2025
Vendor
OpenCV
Product
OpenCV WeChat QR Code Module
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 10, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 27, 2025Record 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=4.0
  2. Affected versionversion=4.1
  3. Affected versionversion=4.2
  4. Affected versionversion=4.3
  5. Affected versionversion=4.4
  6. Affected versionversion=4.5
  7. Affected versionversion=4.6
  8. Affected versionversion=4.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenCV · OpenCV WeChat QR Code Moduleversion=4.0; version=4.1; version=4.2; version=4.3; version=4.4; version=4.5; version=4.6; version=4.7

Published CVSS scores

5.0VulDBAV:N/AC:L/Au:N/C:N/I:N/A:P
5.3VulDBCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-476NULL Pointer Dereference
T1499.004Application 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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