--- title: "CVE-2024-2511: Unbounded memory growth with session… | CubePath" description: "Issue summary: Some non-default TLS server configurations can cause unbounded memory growth when processing TLSv1.3 sessions Impact summary: An attacker…" language: en source: https://cubepath.com/security/cve/CVE-2024-2511 --- # CVE-2024-2511: Unbounded memory growth with session… | CubePath ## 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. Official description from the CVE record, published by openssl. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2024-2511) ## Key data ### CVSS 3.1 Medium 5.9 Score published by CISA-ADP in the CVE record. CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H | Metric | Value | What it means | | ---------------------- | --------- | ----------------------------------------------------------------------------------------- | | Attack vector | Network | The vulnerable component can be reached over a network, possibly from the Internet. | | Attack complexity | High | The attack depends on conditions outside the attacker's control, so it takes preparation. | | Privileges required | None | No account or privileges are needed. | | User interaction | None | No action from any user is needed. | | Scope | Unchanged | The impact stays within the vulnerable component. | | Confidentiality impact | None | No effect on the secrecy of data. | | Integrity impact | None | No effect on the trustworthiness of data. | | Availability impact | High | Serious or total effect on availability. | CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) . ### EPSS Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days. Score 0.59304 (59.3% probability) Percentile 99.1% Scores of Nov 10, 2026 Model v2026.06.15 ### CISA assessment as of Apr 9, 2024 Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA. Automatable no Technical impact partial ### Weakness (CWE) CWE catalog version 5.0. CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license. - [CWE-1325](https://cwe.mitre.org/data/definitions/1325.html) Improperly Controlled Sequential Memory Allocation ## Affected products Products listed in the CVE record, as the CNA published them. - OpenSSL - affected: 3.2.0 up to before 3.2.2 - affected: 3.1.0 up to before 3.1.6 - affected: 3.0.0 up to before 3.0.14 - affected: 1.1.1 up to before 1.1.1y ## References Links listed in the CVE record. They lead to other sites, which CubePath does not control. - [OpenSSL Advisory](https://www.openssl.org/news/secadv/20240408.txt) (openssl.org) vendor-advisory - [3.2.2 git commit](https://github.com/openssl/openssl/commit/e9d7083e241670332e0443da0f0d4ffb52829f08) (github.com) patch - [3.1.6 git commit](https://github.com/openssl/openssl/commit/7e4d731b1c07201ad9374c1cd9ac5263bdf35bce) (github.com) patch - [3.0.14 git commit](https://github.com/openssl/openssl/commit/b52867a9f618bb955bed2a3ce3db4d4f97ed8e5d) (github.com) patch - [1.1.1y git commit](https://github.openssl.org/openssl/extended-releases/commit/5f8d25770ae6437db119dfc951e207271a326640) (github.openssl.org) patch - [openwall.com/lists/oss-security/2024/04/08/5](http://www.openwall.com/lists/oss-security/2024/04/08/5) - [security.netapp.com/advisory/ntap-20240503-0013](https://security.netapp.com/advisory/ntap-20240503-0013/) - [lists.debian.org/debian-lts-announce/2024/11/msg00000.html](https://lists.debian.org/debian-lts-announce/2024/11/msg00000.html) - [lists.debian.org/debian-lts-announce/2024/10/msg00033.html](https://lists.debian.org/debian-lts-announce/2024/10/msg00033.html) ## Timeline 1. ID reserved Mar 15, 2024 2. Record published Apr 8, 2024 3. Record last updated Oct 15, 2026 ## Look up another CVE ## About CubePath CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection. [Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection) Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 20:04 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)