Remote denial of service via unbounded session cache
Published Apr 8, 2024 · Updated May 12, 2026
Denial of service in OpenSSL 1.1.1 and 3.0 through 3.2 allows remote attackers to exhaust TLS 1.3 server memory. With SSL_OP_NO_TICKET enabled, affected session handling leaves the cache in an incorrect state and fails to flush entries as it fills. Exposure requires a TLS 1.3 server using that non-default option, except when early data and default anti-replay protection are both active; clients and FIPS modules are unaffected.
Summary
What happened
Denial of service in OpenSSL 1.1.1 and 3.0 through 3.2 allows remote attackers to exhaust TLS 1.3 server memory. With SSL_OP_NO_TICKET enabled, affected session handling leaves the cache in an incorrect state and fails to flush entries as it fills. Exposure requires a TLS 1.3 server using that non-default option, except when early data and default anti-replay protection are both active; clients and FIPS modules are unaffected.
The record
- CVE
- CVE-2024-2511
- Published
- Apr 8, 2024
- Updated
- May 12, 2026
- Vendor
- Siemens
- Product
- SCALANCE MUM856-1 (RoW)
- Classifications
- CWE-400, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 8, 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?
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- Affected versionversion=0 <V8.2
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
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Your stack
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