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Vulnerability record · CVE-2024-2511 · published 8 April 2024

CVE-2024-2511: Openssl vulnerability

OOpenssl · Openssl

Issue summary: Some non-default TLS server configurations can cause unbounded memory growth when processing TLSv1.3 sessions Impact summary: An attacker may exploit certain server configurations to trigger unbounded memory growth that would lead to a Denial of Service This problem can occur in TLSv1.3 if the non-default SSL_OP_NO_TICKET option is being used (but not if early_data support is also configured and the default anti-replay protection is in use). In this case, under certain conditions, the session cache can get into an incorrect state and it will fail to flush properly as it fills. The session cache will continue to grow in an unbounded manner. A malicious client could deliberately create the scenario for this failure to force a Denial of Service. It may also happen by accident in normal operation. This issue only affects TLS servers supporting TLSv1.3. It does not affect TLS clients. The FIPS modules in 3.2, 3.1 and 3.0 are not affected by this issue. OpenSSL 1.0.2 is also not affected by this issue.

5.9 CVSS 3.1 Medium EPSS 59% · top 0.9% CWE-1325 · CWE-1325
5.9CVSS 3.1 base score
59%EPSS exploitation probability, 30 days
NoNot in CISA KEV
51Affected product versions listed by NVD
20References
6 Nov 2026Last modified by NVD

Description

Issue summary: Some non-default TLS server configurations can cause unbounded memory growth when processing TLSv1.3 sessions Impact summary: An attacker may exploit certain server configurations to trigger unbounded memory growth that would lead to a Denial of Service This problem can occur in TLSv1.3 if the non-default SSL_OP_NO_TICKET option is being used (but not if early_data support is also configured and the default anti-replay protection is in use). In this case, under certain conditions, the session cache can get into an incorrect state and it will fail to flush properly as it fills. The session cache will continue to grow in an unbounded manner. A malicious client could deliberately create the scenario for this failure to force a Denial of Service. It may also happen by accident in normal operation. This issue only affects TLS servers supporting TLSv1.3. It does not affect TLS clients. The FIPS modules in 3.2, 3.1 and 3.0 are not affected by this issue. OpenSSL 1.0.2 is also not affected by this issue.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

51 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/openssl/openssl/commit/7e4d731b1c07201ad9374c1cd9ac5263bdf35bce Patch
https://github.com/openssl/openssl/commit/b52867a9f618bb955bed2a3ce3db4d4f97ed8e5d Patch
https://github.com/openssl/openssl/commit/e9d7083e241670332e0443da0f0d4ffb52829f08 Patch
https://github.openssl.org/openssl/extended-releases/commit/5f8d25770ae6437db119dfc951e207271a326640 Permissions Required
https://www.openssl.org/news/secadv/20240408.txt Vendor Advisory
http://www.openwall.com/lists/oss-security/2024/04/08/5 Mailing ListThird Party Advisory
https://github.com/openssl/openssl/commit/7e4d731b1c07201ad9374c1cd9ac5263bdf35bce Patch
https://github.com/openssl/openssl/commit/b52867a9f618bb955bed2a3ce3db4d4f97ed8e5d Patch
https://github.com/openssl/openssl/commit/e9d7083e241670332e0443da0f0d4ffb52829f08 Patch
https://github.openssl.org/openssl/extended-releases/commit/5f8d25770ae6437db119dfc951e207271a326640 Permissions Required
https://lists.debian.org/debian-lts-announce/2024/10/msg00033.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2024/11/msg00000.html Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20240503-0013/ Third Party Advisory
https://www.openssl.org/news/secadv/20240408.txt Vendor Advisory
https://cert-portal.siemens.com/productcert/html/ssa-265688.html Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-354112.html Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-398330.html Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-613116.html Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-769027.html Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-915275.html Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2024-2511), CISA KEV, FIRST EPSS (scores of 2026-11-13). This page is refreshed as NVD updates the record.