# CVE-2024-2511: libssl1.1: Issue summary: Some non-default TLS server configurations can cause unbounded memory growth when processing TLSv1.3 s... CVE-2024-2511 is fixed in 25 products on 1 platform, first by DEBIAN-CVE-2024-2511, released April 8, 2024. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2024-2511 - Priority: Routine - CVSS: 5.9 (Low) - EPSS: 0.5930 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Apr 8, 2024 ## 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | efi-shell-aa64 Ubuntu 24.04.5 LTS (noble) | 2024.02-2ubuntu0.6 | [efi-shell-aa64 2024.02-2ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-noble-efi-shell-aa64-2024.02-2ubuntu0.6.md) | Aug 12, 2025 | | Linux | efi-shell-arm Ubuntu 24.04.5 LTS (noble) | 2024.02-2ubuntu0.6 | [efi-shell-arm 2024.02-2ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-noble-efi-shell-arm-2024.02-2ubuntu0.6.md) | Aug 12, 2025 | | Linux | efi-shell-ia32 Ubuntu 24.04.5 LTS (noble) | 2024.02-2ubuntu0.6 | [efi-shell-ia32 2024.02-2ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-noble-efi-shell-ia32-2024.02-2ubuntu0.6.md) | Aug 12, 2025 | | Linux | efi-shell-riscv64 Ubuntu 24.04.5 LTS (noble) | 2024.02-2ubuntu0.6 | [efi-shell-riscv64 2024.02-2ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-noble-efi-shell-riscv64-2024.02-2ubuntu0.6.md) | Aug 12, 2025 | | Linux | efi-shell-x64 Ubuntu 24.04.5 LTS (noble) | 2024.02-2ubuntu0.6 | [efi-shell-x64 2024.02-2ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-noble-efi-shell-x64-2024.02-2ubuntu0.6.md) | Aug 12, 2025 | | Linux | libssl1.1 Ubuntu 18.04.6 LTS (bionic) | 1.1.1-1ubuntu2.1~18.04.23+esm10 | [libssl1.1 1.1.1-1ubuntu2.1~18.04.23+esm10](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libssl1.1-1.1.1-1ubuntu2.1-18.04.23-esm10.md) | Aug 27, 2026 | | Linux | libssl1.1 Ubuntu 20.04 LTS (focal) | 1.1.1f-1ubuntu2.23 | [libssl1.1 1.1.1f-1ubuntu2.23](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libssl1.1-1.1.1f-1ubuntu2.23.md) | Jun 27, 2024 | | Linux | libssl3 Ubuntu 22.04.1 LTS (jammy) | 3.0.2-0ubuntu1.17 | [libssl3 3.0.2-0ubuntu1.17](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libssl3-3.0.2-0ubuntu1.17.md) | Jun 27, 2024 | | Linux | libssl3t64 Ubuntu 24.04.5 LTS (noble) | 3.0.13-0ubuntu3.2 | [libssl3t64 3.0.13-0ubuntu3.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libssl3t64-3.0.13-0ubuntu3.2.md) | Jun 27, 2024 | | Linux | libssl3t64 Ubuntu 24.10 (oracular) | 3.2.2-1ubuntu1 | [libssl3t64 3.2.2-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libssl3t64-3.2.2-1ubuntu1.md) | May 28, 2024 | | Linux | libssl3t64 Ubuntu 25.04 (plucky) | 3.2.2-1ubuntu1 | [libssl3t64 3.2.2-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libssl3t64-3.2.2-1ubuntu1.md) | May 28, 2024 | | Linux | openssl Debian 12.15 (bookworm) | 3.0.14-1~deb12u1 | [DEBIAN-CVE-2024-2511](https://patchblox.com/security/data/fix/linux/debian-cve-2024-2511.md) | Apr 8, 2024 | | Linux | openssl Debian 13.5 (trixie) | 3.2.2-1 | [DEBIAN-CVE-2024-2511](https://patchblox.com/security/data/fix/linux/debian-cve-2024-2511.md) | Apr 8, 2024 | | Linux | openssl Debian 14 | 3.2.2-1 | [DEBIAN-CVE-2024-2511](https://patchblox.com/security/data/fix/linux/debian-cve-2024-2511.md) | Apr 8, 2024 | | Linux | openssl RHEL 9 | 1:3.2.2-6.el9_5 | [RHSA-2024:9333](https://patchblox.com/security/data/fix/linux/rhsa-2024-9333.md) | Nov 12, 2024 | | Linux | openssl Ubuntu 18.04.6 LTS (bionic) | 1.1.1-1ubuntu2.1~18.04.23+esm10 | [openssl 1.1.1-1ubuntu2.1~18.04.23+esm10](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-openssl-1.1.1-1ubuntu2.1-18.04.23-esm10.md) | Aug 27, 2026 | | Linux | openssl Ubuntu 20.04 LTS (focal) | 1.1.1f-1ubuntu2.23 | [openssl 1.1.1f-1ubuntu2.23](https://patchblox.com/security/data/fix/linux/ubuntu-focal-openssl-1.1.1f-1ubuntu2.23.md) | Jun 27, 2024 | | Linux | openssl Ubuntu 22.04.1 LTS (jammy) | 3.0.2-0ubuntu1.17 | [openssl 3.0.2-0ubuntu1.17](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-openssl-3.0.2-0ubuntu1.17.md) | Jun 27, 2024 | | Linux | openssl Ubuntu 24.04.5 LTS (noble) | 3.0.13-0ubuntu3.2 | [openssl 3.0.13-0ubuntu3.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-openssl-3.0.13-0ubuntu3.2.md) | Jun 27, 2024 | | Linux | openssl Ubuntu 24.10 (oracular) | 3.2.2-1ubuntu1 | [openssl 3.2.2-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-openssl-3.2.2-1ubuntu1.md) | May 28, 2024 | | Linux | openssl Ubuntu 25.04 (plucky) | 3.2.2-1ubuntu1 | [openssl 3.2.2-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-openssl-3.2.2-1ubuntu1.md) | May 28, 2024 | | Linux | openssl almalinux 9 | 1:3.2.2-6.el9_5 | [ALSA-2024:9333](https://patchblox.com/security/data/fix/linux/alsa-2024-9333.md) | Nov 12, 2024 | | Linux | openssl amzn 2023 | 1:3.0.8-1.amzn2023.0.12 | [ALAS2023-2024-640](https://patchblox.com/security/data/fix/linux/alas2023-2024-640.md) | Jun 6, 2024 | | Linux | openssl ol 9 | 1:3.2.2-6.0.1.el9_5 | [ELSA-2024-9333](https://patchblox.com/security/data/fix/linux/elsa-2024-9333.md) | Nov 14, 2024 | | Linux | openssl rocky 9 | 1:3.2.2-6.el9_5.1 | [RLSA-2024:9333](https://patchblox.com/security/data/fix/linux/rlsa-2024-9333.md) | Mar 17, 2025 | | Linux | openssl-debuginfo amzn 2023 | 1:3.0.8-1.amzn2023.0.12 | [ALAS2023-2024-640](https://patchblox.com/security/data/fix/linux/alas2023-2024-640.md) | Jun 6, 2024 | | Linux | openssl-debugsource amzn 2023 | 1:3.0.8-1.amzn2023.0.12 | [ALAS2023-2024-640](https://patchblox.com/security/data/fix/linux/alas2023-2024-640.md) | Jun 6, 2024 | | Linux | openssl-devel RHEL 9 | 1:3.2.2-6.el9_5 | [RHSA-2024:9333](https://patchblox.com/security/data/fix/linux/rhsa-2024-9333.md) | Nov 12, 2024 | | Linux | openssl-devel almalinux 9 | 1:3.2.2-6.el9_5 | [ALSA-2024:9333](https://patchblox.com/security/data/fix/linux/alsa-2024-9333.md) | Nov 12, 2024 | | Linux | openssl-devel amzn 2023 | 1:3.0.8-1.amzn2023.0.12 | [ALAS2023-2024-640](https://patchblox.com/security/data/fix/linux/alas2023-2024-640.md) | Jun 6, 2024 | | Linux | openssl-devel ol 9 | 1:3.2.2-6.0.1.el9_5 | [ELSA-2024-9333](https://patchblox.com/security/data/fix/linux/elsa-2024-9333.md) | Nov 14, 2024 | | Linux | openssl-fips-provider ol 9 | 0:3.0.7-6.0.1.el9_5 | [ELSA-2024-9333](https://patchblox.com/security/data/fix/linux/elsa-2024-9333.md) | Nov 14, 2024 | | Linux | openssl-fips-provider rocky 9 | 0:3.0.7-6.el9_5 | [RLSA-2024:9333](https://patchblox.com/security/data/fix/linux/rlsa-2024-9333.md) | Mar 17, 2025 | | Linux | openssl-fips-provider-so ol 9 | 0:3.0.7-6.0.1.el9_5 | [ELSA-2024-9333](https://patchblox.com/security/data/fix/linux/elsa-2024-9333.md) | Nov 14, 2024 | | Linux | openssl-libs RHEL 9 | 1:3.2.2-6.el9_5 | [RHSA-2024:9333](https://patchblox.com/security/data/fix/linux/rhsa-2024-9333.md) | Nov 12, 2024 | | Linux | openssl-libs almalinux 9 | 1:3.2.2-6.el9_5 | [ALSA-2024:9333](https://patchblox.com/security/data/fix/linux/alsa-2024-9333.md) | Nov 12, 2024 | | Linux | openssl-libs amzn 2023 | 1:3.0.8-1.amzn2023.0.12 | [ALAS2023-2024-640](https://patchblox.com/security/data/fix/linux/alas2023-2024-640.md) | Jun 6, 2024 | | Linux | openssl-libs ol 9 | 1:3.2.2-6.0.1.el9_5 | [ELSA-2024-9333](https://patchblox.com/security/data/fix/linux/elsa-2024-9333.md) | Nov 14, 2024 | | Linux | openssl-libs-debuginfo amzn 2023 | 1:3.0.8-1.amzn2023.0.12 | [ALAS2023-2024-640](https://patchblox.com/security/data/fix/linux/alas2023-2024-640.md) | Jun 6, 2024 | | Linux | openssl-perl RHEL 9 | 1:3.2.2-6.el9_5 | [RHSA-2024:9333](https://patchblox.com/security/data/fix/linux/rhsa-2024-9333.md) | Nov 12, 2024 | | Linux | openssl-perl almalinux 9 | 1:3.2.2-6.el9_5 | [ALSA-2024:9333](https://patchblox.com/security/data/fix/linux/alsa-2024-9333.md) | Nov 12, 2024 | | Linux | openssl-perl amzn 2023 | 1:3.0.8-1.amzn2023.0.12 | [ALAS2023-2024-640](https://patchblox.com/security/data/fix/linux/alas2023-2024-640.md) | Jun 6, 2024 | | Linux | openssl-perl ol 9 | 1:3.2.2-6.0.1.el9_5 | [ELSA-2024-9333](https://patchblox.com/security/data/fix/linux/elsa-2024-9333.md) | Nov 14, 2024 | | Linux | openssl-snapsafe-libs amzn 2023 | 1:3.0.8-1.amzn2023.0.12 | [ALAS2023-2024-640](https://patchblox.com/security/data/fix/linux/alas2023-2024-640.md) | Jun 6, 2024 | | Linux | openssl-snapsafe-libs-debuginfo amzn 2023 | 1:3.0.8-1.amzn2023.0.12 | [ALAS2023-2024-640](https://patchblox.com/security/data/fix/linux/alas2023-2024-640.md) | Jun 6, 2024 | | Linux | ovmf Ubuntu 22.04.1 LTS (jammy) | 2022.02-3ubuntu0.22.04.4 | [ovmf 2022.02-3ubuntu0.22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-ovmf-2022.02-3ubuntu0.22.04.4.md) | Aug 12, 2025 | | Linux | ovmf Ubuntu 24.04.5 LTS (noble) | 2024.02-2ubuntu0.6 | [ovmf 2024.02-2ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-noble-ovmf-2024.02-2ubuntu0.6.md) | Aug 12, 2025 | | Linux | ovmf-ia32 Ubuntu 22.04.1 LTS (jammy) | 2022.02-3ubuntu0.22.04.4 | [ovmf-ia32 2022.02-3ubuntu0.22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-ovmf-ia32-2022.02-3ubuntu0.22.04.4.md) | Aug 12, 2025 | | Linux | ovmf-ia32 Ubuntu 24.04.5 LTS (noble) | 2024.02-2ubuntu0.6 | [ovmf-ia32 2024.02-2ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-noble-ovmf-ia32-2024.02-2ubuntu0.6.md) | Aug 12, 2025 | | Linux | qemu-efi Ubuntu 22.04.1 LTS (jammy) | 2022.02-3ubuntu0.22.04.4 | [qemu-efi 2022.02-3ubuntu0.22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-qemu-efi-2022.02-3ubuntu0.22.04.4.md) | Aug 12, 2025 | | Linux | qemu-efi-aarch64 Ubuntu 22.04.1 LTS (jammy) | 2022.02-3ubuntu0.22.04.4 | [qemu-efi-aarch64 2022.02-3ubuntu0.22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-qemu-efi-aarch64-2022.02-3ubuntu0.22.04.4.md) | Aug 12, 2025 | | Linux | qemu-efi-aarch64 Ubuntu 24.04.5 LTS (noble) | 2024.02-2ubuntu0.6 | [qemu-efi-aarch64 2024.02-2ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-noble-qemu-efi-aarch64-2024.02-2ubuntu0.6.md) | Aug 12, 2025 | | Linux | qemu-efi-arm Ubuntu 22.04.1 LTS (jammy) | 2022.02-3ubuntu0.22.04.4 | [qemu-efi-arm 2022.02-3ubuntu0.22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-qemu-efi-arm-2022.02-3ubuntu0.22.04.4.md) | Aug 12, 2025 | | Linux | qemu-efi-arm Ubuntu 24.04.5 LTS (noble) | 2024.02-2ubuntu0.6 | [qemu-efi-arm 2024.02-2ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-noble-qemu-efi-arm-2024.02-2ubuntu0.6.md) | Aug 12, 2025 | | Linux | qemu-efi-riscv64 Ubuntu 24.04.5 LTS (noble) | 2024.02-2ubuntu0.6 | [qemu-efi-riscv64 2024.02-2ubuntu0.6](https://patchblox.com/security/data/fix/linux/ubuntu-noble-qemu-efi-riscv64-2024.02-2ubuntu0.6.md) | Aug 12, 2025 | --- Data as of 2026-11-08T19:12:23Z UTC. 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