--- title: "CVE-2023-3446\n | Ubuntu" description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/CVE-2023-3446?format=md keywords: index, follow --- # CVE-2023-3446 Publication date 19 July 2023 Last updated 26 November 2025 --- Ubuntu priority **Low** [Why this priority?](https://ubuntu.com/security/CVE-2023-3446?format=md#priority-reason ) ## Cvss 3 Severity Score **5.3 · Medium** [Score breakdown](https://ubuntu.com/security/CVE-2023-3446?format=md#impact-score) Toggle side navigation ## Description Issue summary: Checking excessively long DH keys or parameters may be very slow. Impact summary: Applications that use the functions DH\_check(), DH\_check\_ex() or EVP\_PKEY\_param\_check() to check a DH key or DH parameters may experience long delays. Where the key or parameters that are being checked have been obtained from an untrusted source this may lead to a Denial of Service. The function DH\_check() performs various checks on DH parameters. One of those checks confirms that the modulus ('p' parameter) is not too large. Trying to use a very large modulus is slow and OpenSSL will not normally use a modulus which is over 10,000 bits in length. However the DH\_check() function checks numerous aspects of the key or parameters that have been supplied. Some of those checks use the supplied modulus value even if it has already been found to be too large. An application that calls DH\_check() and supplies a key or parameters obtained from an untrusted source could be vulernable to a Denial of Service attack. The function DH\_check() is itself called by a number of other OpenSSL functions. An application calling any of those other functions may similarly be affected. The other functions affected by this are DH\_check\_ex() and EVP\_PKEY\_param\_check(). Also vulnerable are the OpenSSL dhparam and pkeyparam command line applications when using the '-check' option. The OpenSSL SSL/TLS implementation is not affected by this issue. The OpenSSL 3.0 and 3.1 FIPS providers are not affected by this issue. ### Why is this CVE low priority? Upstream openssl developers have rated this issue as being low severity [Learn more about Ubuntu priority](https://ubuntu.com/security/cves/about#priority) ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | edk2 | 26.04 LTS resolute | Not affected | | 25.10 questing | Not affected | | 25.04 plucky | Not affected | | 24.10 oracular | Ignored end of life, was needed | | 24.04 LTS noble | Fixed 2024.02-2ubuntu0.6 | | 23.10 mantic | Ignored end of life, was needed | | 23.04 lunar | Ignored end of life, was needs-triage | | 22.10 kinetic | Ignored end of life, was needs-triage | | 22.04 LTS jammy | Fixed 2022.02-3ubuntu0.22.04.4 | | 20.04 LTS focal | Vulnerable | | 18.04 LTS bionic | Needs evaluation | | 16.04 LTS xenial | Needs evaluation | | 14.04 LTS trusty | Ignored end of standard support | | nodejs | 26.04 LTS resolute | Not affected | | 25.10 questing | Not affected | | 25.04 plucky | Not affected | | 24.10 oracular | Not affected | | 24.04 LTS noble | Not affected | | 23.10 mantic | Not affected | | 23.04 lunar | Not affected | | 22.10 kinetic | Not affected | | 22.04 LTS jammy | Vulnerable | | 20.04 LTS focal | Not affected | | 18.04 LTS bionic | Not affected | | 16.04 LTS xenial | Not affected | | 14.04 LTS trusty | Not affected | | openssl | 26.04 LTS resolute | Not affected | | 25.10 questing | Not affected | | 25.04 plucky | Not affected | | 24.10 oracular | Not affected | | 24.04 LTS noble | Not affected | | 23.10 mantic | Not affected | | 23.04 lunar | Fixed 3.0.8-1ubuntu1.4 | | 22.10 kinetic | Ignored end of life, was needs-triage | | 22.04 LTS jammy | Fixed 3.0.2-0ubuntu1.12 | | 20.04 LTS focal | Fixed 1.1.1f-1ubuntu2.20 | | 18.04 LTS bionic | Fixed 1.1.1-1ubuntu2.1~18.04.23+esm3 Ubuntu Pro | | 16.04 LTS xenial | Fixed 1.0.2g-1ubuntu4.20+esm10 Ubuntu Pro | | 14.04 LTS trusty | Fixed 1.0.1f-1ubuntu2.27+esm10 Ubuntu Pro | | openssl1.0 | 26.04 LTS resolute | Not in release | | 25.10 questing | Not in release | | 25.04 plucky | Not in release | | 24.10 oracular | Not in release | | 24.04 LTS noble | Not in release | | 23.10 mantic | Not in release | | 23.04 lunar | Not in release | | 22.10 kinetic | Not in release | | 22.04 LTS jammy | Not in release | | 20.04 LTS focal | Not in release | | 18.04 LTS bionic | Fixed 1.0.2n-1ubuntu5.13+esm1 Ubuntu Pro | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Not in release | --- * [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) * [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses) ### Get expanded security coverage with Ubuntu Pro Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. 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[Get Ubuntu Pro](https://ubuntu.com/pro) [30-day free trial](https://ubuntu.com/pro/free-trial) ## Severity score breakdown CVSS version: CVSS v3.0 **Base score** 5.3 · Medium * Base metrics | Parameter | Value | | --- | --- | | Attack vector | Network | | Attack complexity | Low | | Privileges required | None | | User interaction | None | | Scope | Unchanged | | Confidentiality impact | None | | Integrity impact | None | | Availability impact | Low | * Scores | Parameter | Value | | --- | --- | | Base score | 5.3 · Medium | | Exploitability score | - | | Impact score | - | **Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-3446) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2023-3446) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2023-3446) * [Debian](https://security-tracker.debian.org/tracker/CVE-2023-3446) ### Related Ubuntu Security Notices (USN) + [USN-6435-1](https://usn.ubuntu.com/USN-6435-1) + OpenSSL vulnerabilities + 18 October 2023 + [USN-6450-1](https://usn.ubuntu.com/USN-6450-1) + OpenSSL vulnerabilities + 24 October 2023 + [USN-6435-2](https://usn.ubuntu.com/USN-6435-2) + OpenSSL vulnerabilities + 25 October 2023 + [USN-6709-1](https://usn.ubuntu.com/USN-6709-1) + OpenSSL vulnerabilities + 21 March 2024 + [USN-7018-1](https://usn.ubuntu.com/USN-7018-1) + OpenSSL vulnerabilities + 18 September 2024 + [USN-7894-1](https://usn.ubuntu.com/USN-7894-1) + EDK II vulnerabilities + 26 November 2025 ### Other references * *