# CVE-2023-0464: libssl3t64: A security vulnerability has been identified in all supported versionsof OpenSSL related to the verification of X.509... CVE-2023-0464 is fixed in 17 products on 1 platform, first by DEBIAN-CVE-2023-0464, released March 22, 2023. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2023-0464 - Priority: High - CVSS: 7.5 (Low) - EPSS: 0.0399 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Mar 22, 2023 ## Description A security vulnerability has been identified in all supported versionsof OpenSSL related to the verification of X.509 certificate chainsthat include policy constraints. Attackers may be able to exploit thisvulnerability by creating a malicious certificate chain that triggersexponential use of computational resources, leading to a denial-of-service(DoS) attack on affected systems.Policy processing is disabled by default but can be enabled by passingthe `-policy' argument to the command line utilities or by calling the`X509_VERIFY_PARAM_set1_policies()' function. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | libssl1.0.0 Ubuntu 18.04.6 LTS (bionic) | 1.0.2n-1ubuntu5.12 | [libssl1.0.0 1.0.2n-1ubuntu5.12](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libssl1.0.0-1.0.2n-1ubuntu5.12.md) | Mar 28, 2023 | | Linux | libssl1.1 Ubuntu 18.04.6 LTS (bionic) | 1.1.1-1ubuntu2.1~18.04.22 | [libssl1.1 1.1.1-1ubuntu2.1~18.04.22](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libssl1.1-1.1.1-1ubuntu2.1-18.04.22.md) | Mar 28, 2023 | | Linux | libssl1.1 Ubuntu 20.04 LTS (focal) | 1.1.1f-1ubuntu2.18 | [libssl1.1 1.1.1f-1ubuntu2.18](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libssl1.1-1.1.1f-1ubuntu2.18.md) | Mar 28, 2023 | | Linux | libssl3 Ubuntu 22.04.1 LTS (jammy) | 3.0.2-0ubuntu1.9 | [libssl3 3.0.2-0ubuntu1.9](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libssl3-3.0.2-0ubuntu1.9.md) | Mar 28, 2023 | | Linux | libssl3t64 Ubuntu 24.10 (oracular) | 3.0.8-1ubuntu2 | [libssl3t64 3.0.8-1ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libssl3t64-3.0.8-1ubuntu2.md) | Jan 16, 2026 | | Linux | libssl3t64 Ubuntu 25.04 (plucky) | 3.0.8-1ubuntu2 | [libssl3t64 3.0.8-1ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libssl3t64-3.0.8-1ubuntu2.md) | Jan 16, 2026 | | Linux | openssl Debian 11.6 (bullseye) | 1.1.1n-0+deb11u5 | [DSA-5417-1](https://patchblox.com/security/data/fix/linux/dsa-5417-1.md) | May 31, 2023 | | Linux | openssl Debian 12.15 (bookworm) | 3.0.9-1 | [DEBIAN-CVE-2023-0464](https://patchblox.com/security/data/fix/linux/debian-cve-2023-0464.md) | Mar 22, 2023 | | Linux | openssl Debian 13.5 (trixie) | 3.0.9-1 | [DEBIAN-CVE-2023-0464](https://patchblox.com/security/data/fix/linux/debian-cve-2023-0464.md) | Mar 22, 2023 | | Linux | openssl Debian 14 | 3.0.9-1 | [DEBIAN-CVE-2023-0464](https://patchblox.com/security/data/fix/linux/debian-cve-2023-0464.md) | Mar 22, 2023 | | Linux | openssl RHEL 9 | 1:3.0.7-16.el9_2 | [RHSA-2023:3722](https://patchblox.com/security/data/fix/linux/rhsa-2023-3722.md) | Jun 21, 2023 | | Linux | openssl Ubuntu 18.04.6 LTS (bionic) | 1.1.1-1ubuntu2.1~18.04.22 | [openssl 1.1.1-1ubuntu2.1~18.04.22](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-openssl-1.1.1-1ubuntu2.1-18.04.22.md) | Mar 28, 2023 | | Linux | openssl Ubuntu 20.04 LTS (focal) | 1.1.1f-1ubuntu2.18 | [openssl 1.1.1f-1ubuntu2.18](https://patchblox.com/security/data/fix/linux/ubuntu-focal-openssl-1.1.1f-1ubuntu2.18.md) | Mar 28, 2023 | | Linux | openssl Ubuntu 22.04.1 LTS (jammy) | 3.0.2-0ubuntu1.9 | [openssl 3.0.2-0ubuntu1.9](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-openssl-3.0.2-0ubuntu1.9.md) | Mar 28, 2023 | | Linux | openssl Ubuntu 24.10 (oracular) | 3.0.8-1ubuntu2 | [openssl 3.0.8-1ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-openssl-3.0.8-1ubuntu2.md) | Jan 16, 2026 | | Linux | openssl Ubuntu 25.04 (plucky) | 3.0.8-1ubuntu2 | [openssl 3.0.8-1ubuntu2](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-openssl-3.0.8-1ubuntu2.md) | Jan 16, 2026 | | Linux | openssl almalinux 9 | 1:3.0.7-16.el9_2 | [ALSA-2023:3722](https://patchblox.com/security/data/fix/linux/alsa-2023-3722.md) | Jun 21, 2023 | | Linux | openssl amzn 2023 | 1:3.0.8-1.amzn2023.0.2 | [ALAS2023-2023-181](https://patchblox.com/security/data/fix/linux/alas2023-2023-181.md) | May 11, 2023 | | Linux | openssl ol 9 | 2:3.0.7-16.0.1.ksplice1.el9_2 | [ELSA-2023-12768](https://patchblox.com/security/data/fix/linux/elsa-2023-12768.md) | Aug 31, 2023 | | Linux | openssl-debuginfo amzn 2023 | 1:3.0.8-1.amzn2023.0.2 | [ALAS2023-2023-181](https://patchblox.com/security/data/fix/linux/alas2023-2023-181.md) | May 11, 2023 | | Linux | openssl-debugsource amzn 2023 | 1:3.0.8-1.amzn2023.0.2 | [ALAS2023-2023-181](https://patchblox.com/security/data/fix/linux/alas2023-2023-181.md) | May 11, 2023 | | Linux | openssl-devel RHEL 9 | 1:3.0.7-16.el9_2 | [RHSA-2023:3722](https://patchblox.com/security/data/fix/linux/rhsa-2023-3722.md) | Jun 21, 2023 | | Linux | openssl-devel almalinux 9 | 1:3.0.7-16.el9_2 | [ALSA-2023:3722](https://patchblox.com/security/data/fix/linux/alsa-2023-3722.md) | Jun 21, 2023 | | Linux | openssl-devel amzn 2023 | 1:3.0.8-1.amzn2023.0.2 | [ALAS2023-2023-181](https://patchblox.com/security/data/fix/linux/alas2023-2023-181.md) | May 11, 2023 | | Linux | openssl-devel ol 9 | 2:3.0.7-16.0.1.ksplice1.el9_2 | [ELSA-2023-12768](https://patchblox.com/security/data/fix/linux/elsa-2023-12768.md) | Aug 31, 2023 | | Linux | openssl-libs RHEL 9 | 1:3.0.7-16.el9_2 | [RHSA-2023:3722](https://patchblox.com/security/data/fix/linux/rhsa-2023-3722.md) | Jun 21, 2023 | | Linux | openssl-libs almalinux 9 | 1:3.0.7-16.el9_2 | [ALSA-2023:3722](https://patchblox.com/security/data/fix/linux/alsa-2023-3722.md) | Jun 21, 2023 | | Linux | openssl-libs amzn 2023 | 1:3.0.8-1.amzn2023.0.2 | [ALAS2023-2023-181](https://patchblox.com/security/data/fix/linux/alas2023-2023-181.md) | May 11, 2023 | | Linux | openssl-libs ol 9 | 2:3.0.7-16.0.1.ksplice1.el9_2 | [ELSA-2023-12768](https://patchblox.com/security/data/fix/linux/elsa-2023-12768.md) | Aug 31, 2023 | | Linux | openssl-libs-debuginfo amzn 2023 | 1:3.0.8-1.amzn2023.0.2 | [ALAS2023-2023-181](https://patchblox.com/security/data/fix/linux/alas2023-2023-181.md) | May 11, 2023 | | Linux | openssl-perl RHEL 9 | 1:3.0.7-16.el9_2 | [RHSA-2023:3722](https://patchblox.com/security/data/fix/linux/rhsa-2023-3722.md) | Jun 21, 2023 | | Linux | openssl-perl almalinux 9 | 1:3.0.7-16.el9_2 | [ALSA-2023:3722](https://patchblox.com/security/data/fix/linux/alsa-2023-3722.md) | Jun 21, 2023 | | Linux | openssl-perl amzn 2023 | 1:3.0.8-1.amzn2023.0.2 | [ALAS2023-2023-181](https://patchblox.com/security/data/fix/linux/alas2023-2023-181.md) | May 11, 2023 | | Linux | openssl-perl ol 9 | 2:3.0.7-16.0.1.ksplice1.el9_2 | [ELSA-2023-12768](https://patchblox.com/security/data/fix/linux/elsa-2023-12768.md) | Aug 31, 2023 | | Linux | openssl1.0 Ubuntu 18.04.6 LTS (bionic) | 1.0.2n-1ubuntu5.12 | [openssl1.0 1.0.2n-1ubuntu5.12](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-openssl1.0-1.0.2n-1ubuntu5.12.md) | Mar 28, 2023 | | 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-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 | 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-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 | --- Data as of 2026-11-08T00:53:09Z UTC. 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