Memory corruption via oversized insertion position
Published May 6, 2025 · Updated Aug 25, 2026
Buffer underwrite in GLib before 2.84.2 allows remote attackers to corrupt memory or crash an application via an oversized insertion position. g_string_insert_unichar performs pointer arithmetic with the signed position, allowing a sufficiently large value to wrap before character bytes are written. Reachability depends on consuming software passing an attacker-controlled position; the grounded consequences are memory modification and process interruption.
Summary
What happened
Buffer underwrite in GLib before 2.84.2 allows remote attackers to corrupt memory or crash an application via an oversized insertion position. g_string_insert_unichar performs pointer arithmetic with the signed position, allowing a sufficiently large value to wrap before character bytes are written. Reachability depends on consuming software passing an attacker-controlled position; the grounded consequences are memory modification and process interruption.
The record
- CVE
- CVE-2025-4373
- Published
- May 6, 2025
- Updated
- Aug 25, 2026
- Vendor
- Siemens
- Product
- SCALANCE XRM334 (24 V DC, 12xFO)
- Classifications
- CWE-124
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 6, 2025CVE publishedPublication date reported by the CVE source.
- Aug 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=0 <V3.3
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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