An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello), but includes a signature_algorithms_cert extension then a NULL pointer dereference will result, leading to a crash and a denial of service attack. A server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which is the default configuration). OpenSSL TLS clients are not impacted by this issue. All OpenSSL 1.1.1 versions are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Fixed in OpenSSL 1.1.1k (Affected 1.1.1-1.1.1j).
CVSS Details
- CVSS 3.1 Base Score: 5.9
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade openssl-develUpgrade openssl-perlUpgrade openssl-libsUpgrade openssl | May 4, 2022 | Mar 25, 2021 |
| Alpine Linux | — | Upgrade opensslUpgrade synapseUpgrade openssl3Upgrade openssl1.1-compat | Jun 17, 2022 | Mar 25, 2021 |
| Amazon Linux Ami 2 | — | Upgrade edk2-debuginfoUpgrade openssl11-staticUpgrade openssl11Upgrade edk2-tools-pythonUpgrade openssl11-debuginfoUpgrade edk2-ovmfUpgrade openssl11-libsUpgrade openssl11-develUpgrade edk2-tools-docUpgrade edk2-aarch64Upgrade edk2-tools | Mar 29, 2021 | Mar 25, 2021 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Mar 25, 2021 |
| Centos_linux | — | Upgrade openssl-libs-debuginfoUpgrade openssl-perlUpgrade opensslUpgrade openssl-debugsourceUpgrade openssl-libsUpgrade openssl-develUpgrade openssl-debuginfo | Mar 31, 2021 | Mar 25, 2021 |
| Check Point Gaia | — | Upgrade to supported version Check Point Gaia. | Feb 25, 2026 | Apr 10, 2021 |
| Debian | — | Upgrade openssl | Mar 29, 2021 | Mar 25, 2021 |
| Freebsd | — | Upgrade mariadb103-serverUpgrade mysql56-serverUpgrade opensslUpgrade mariadb105-serverUpgrade node10Upgrade node14Upgrade node12Upgrade mysql57-serverUpgrade mysql80-serverUpgrade nodeUpgrade mariadb104-serverUpgrade FreeBSD | Apr 20, 2021 | Apr 20, 2021 |
| Gentoo Linux | — | Upgrade dev-libs/openssl. | Apr 1, 2021 | Mar 25, 2021 |
| Http Openssl | — | Upgrade to the latest version of OpenSSL | Mar 26, 2021 | Mar 25, 2021 |
| Huawei Euleros 2_0_sp5 | — | Upgrade openssl111d-libsUpgrade openssl111dUpgrade openssl111d-develUpgrade openssl111d-static | Jul 19, 2021 | Mar 25, 2021 |
| Huawei Euleros 2_0_sp8 | — | Upgrade openssl-libsUpgrade openssl-develUpgrade openssl-perlUpgrade openssl | Jun 28, 2021 | Mar 25, 2021 |
| Huawei Euleros 2_0_sp9 | — | Upgrade openssl-perlUpgrade openssl-libsUpgrade openssl | Jul 2, 2021 | Mar 25, 2021 |
| Microsoft Visual_studio | — | Update Microsoft Visual Studio 2019 to the latest version in the LTSC 16.9 version stream, or upgrade to a newer supported version of Visual Studio 2019.Update Microsoft Visual Studio 2019 to the latest version in the LTSC 16.7 version stream, or upgrade to a newer supported version of Visual Studio 2019.Update Microsoft Visual Studio 2019 to the latest version in the LTSC 16.11 version stream, or upgrade to a newer supported version of Visual Studio 2019.Update Microsoft Visual Studio 2017 to the latest version in the LTSC 15.9 version stream, or upgrade to a newer supported version of Visual Studio 2017.Update Microsoft Visual Studio 2019 to the latest version in the LTSC 16.4 version stream, or upgrade to a newer supported version of Visual Studio 2019. | Jun 25, 2025 | Oct 12, 2021 |
| Oracle Mysql | — | Upgrade to MySQL version 8.0.24Upgrade to MySQL version 5.7.34 | Jun 15, 2026 | Mar 25, 2021 |
| Oracle Solaris | — | Upgrade library/security/openssl to version 1.0.2.25-11.4.36.0.1.101.0 on Solaris 11.4Upgrade runtime/nodejs to version 14.17.0-11.4.36.0.1.101.0 on Solaris 11.4Upgrade database/mysql-57/embedded to version 5.7.34-11.4.35.0.1.94.2 on Solaris 11.4Upgrade database/mysql-57/client to version 5.7.34-11.4.35.0.1.94.2 on Solaris 11.4Upgrade library/security/openssl/openssl-fips-140 to version 2.0.15-11.4.36.0.1.101.0 on Solaris 11.4Upgrade database/mysql-57/library to version 5.7.34-11.4.35.0.1.94.2 on Solaris 11.4Upgrade library/security/openssl-11 to version 1.1.1.11-11.4.35.0.1.94.2 on Solaris 11.4Upgrade runtime/nodejs/nodejs-12 to version 12.22.1-11.4.36.0.1.101.0 on Solaris 11.4Upgrade database/mysql-57/tests to version 5.7.34-11.4.35.0.1.94.2 on Solaris 11.4Upgrade database/mysql-57 to version 5.7.34-11.4.35.0.1.94.2 on Solaris 11.4Upgrade runtime/nodejs/nodejs-14 to version 14.17.0-11.4.36.0.1.101.0 on Solaris 11.4 | Jul 21, 2021 | Mar 25, 2021 |
| Oracle_linux | — | Upgrade opensslUpgrade openssl-debugsourceUpgrade openssl-develUpgrade openssl-libsUpgrade openssl-perlUpgrade openssl-static | Mar 30, 2021 | Mar 25, 2021 |
| Redhat_linux | — | Upgrade openssl-perlUpgrade openssl-libsUpgrade openssl-develUpgrade openssl-debuginfoUpgrade openssl-libs-debuginfoUpgrade opensslUpgrade openssl-debugsource | Mar 31, 2021 | Mar 25, 2021 |
| Rocky_linux | — | Upgrade opensslUpgrade openssl-debugsourceUpgrade openssl-libs-debuginfoUpgrade openssl-develUpgrade openssl-libsUpgrade openssl-debuginfoUpgrade openssl-perl | Mar 12, 2024 | Mar 25, 2021 |
| Sonicwall Email Security | — | Update SonicWall Email Security to version 10.0.11 or later | Sep 22, 2025 | Jul 16, 2021 |
| Sonicwall Email Security Appliances | — | — | Sep 4, 2025 | Jul 15, 2021 |
| Sonicwall Sonicos | — | Update SonicWall SonicOS Gen7 to version 7.0.1-R1456 or later | May 25, 2026 | Jul 16, 2021 |
| Suse | — | Upgrade openssl-1_1Upgrade nodejs10-develUpgrade libopenssl1_1-32bitUpgrade libopenssl1_1-hmac-32bitUpgrade openssl-1_1-docUpgrade nodejs10-docsUpgrade libopenssl1_1Upgrade libopenssl1_1-hmacUpgrade npm10Upgrade libopenssl-1_1-develUpgrade libopenssl-1_1-devel-32bitUpgrade nodejs12-develUpgrade nodejs12-docsUpgrade nodejs12Upgrade npm12Upgrade nodejs10 | Mar 26, 2021 | Mar 25, 2021 |
| Ubuntu | — | Upgrade postgresql-13Upgrade postgresql-12Upgrade postgresql-10Upgrade libssl1.1 | Mar 26, 2021 | Mar 25, 2021 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Mar 25, 2021 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub