Process crash via deflate symbol-buffer overwrite
Published Mar 25, 2022 · Updated Jul 14, 2026
Out-of-bounds write in Siemens products using zlib allows remote attackers to crash an affected process during compression of crafted data. When Z_FIXED processes input containing many distant matches, the pending output buffer overwrites the distance symbol table sharing its storage, producing invalid distances and out-of-bounds accesses. Reachability requires an affected product to pass attacker-controlled data into zlib's deflate path; the documented consequence is a service-interrupting process crash.
Summary
What happened
Out-of-bounds write in Siemens products using zlib allows remote attackers to crash an affected process during compression of crafted data. When Z_FIXED processes input containing many distant matches, the pending output buffer overwrites the distance symbol table sharing its storage, producing invalid distances and out-of-bounds accesses. Reachability requires an affected product to pass attacker-controlled data into zlib's deflate path; the documented consequence is a service-interrupting process crash.
The record
- CVE
- CVE-2018-25032
- Published
- Mar 25, 2022
- Updated
- Jul 14, 2026
- Vendor
- Siemens
- Product
- SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
- Classifications
- CWE-787, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 25, 2022CVE publishedPublication date reported by the CVE source.
- Jul 14, 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=V3.1.0 <V3.1.5
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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Public exploit references
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Technologies
Your stack
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Your stack
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