Denial of service via oversized prime RSA modulus
Published Apr 25, 2024 · Updated May 12, 2026
Resource exhaustion in OpenSSL 3.0.0 through 3.0.12, 3.1.0 through 3.1.4, and 3.2.0 allows attackers to cause long delays. EVP_PKEY_public_check() attempts to prove that an untrusted RSA modulus is composite without first limiting its size, so an overly large prime forces a prolonged computation. Exposure requires an application to pass attacker-controlled keys to that API, or use the pkey command with -pubin and -check; TLS processing is unaffected and the bounded consequence is a service hang.
Summary
What happened
Resource exhaustion in OpenSSL 3.0.0 through 3.0.12, 3.1.0 through 3.1.4, and 3.2.0 allows attackers to cause long delays. EVP_PKEY_public_check() attempts to prove that an untrusted RSA modulus is composite without first limiting its size, so an overly large prime forces a prolonged computation. Exposure requires an application to pass attacker-controlled keys to that API, or use the pkey command with -pubin and -check; TLS processing is unaffected and the bounded consequence is a service hang.
The record
- CVE
- CVE-2023-6237
- Published
- Apr 25, 2024
- Updated
- May 12, 2026
- Vendor
- Siemens
- Product
- SINEC NMS
- Classifications
- CWE-606, CWE-400, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 25, 2024CVE publishedPublication date reported by the CVE source.
- May 12, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <V3.0 SP1
What conditions does exploitation require?
What is affected?
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
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Technologies
Your stack
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Your stack
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