Remote code execution via undersized module buffer
Published Apr 4, 2023 · Updated Feb 18, 2025
Heap buffer overflow in nginx njs before 0.3.4 allows remote attackers to execute arbitrary code through a crafted module import. In njs_module_read, a nonregular import target causes allocation to omit the target size while read still copies sb.st_size bytes into the heap buffer. The public proof of concept imports a directory rather than a regular JavaScript file; successful exploitation runs code in the affected njs process.
Summary
What happened
Heap buffer overflow in nginx njs before 0.3.4 allows remote attackers to execute arbitrary code through a crafted module import. In njs_module_read, a nonregular import target causes allocation to omit the target size while read still copies sb.st_size bytes into the heap buffer. The public proof of concept imports a directory rather than a regular JavaScript file; successful exploitation runs code in the affected njs process.
The record
- CVE
- CVE-2020-19692
- Published
- Apr 4, 2023
- Updated
- Feb 18, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-120
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 4, 2023CVE publishedPublication date reported by the CVE source.
- Feb 18, 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?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- Directory-import proof of conceptproof of concept · unverified
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Technologies
Your stack
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Your stack
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