--- title: "CVE-2023-38802\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-2023-38802?format=md keywords: index, follow --- # CVE-2023-38802 Publication date 28 August 2023 Last updated 26 August 2025 --- Ubuntu priority **Medium** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) ## Cvss 3 Severity Score **7.5 · High** [Score breakdown](https://ubuntu.com/security/CVE-2023-38802?format=md#impact-score) Toggle side navigation ## Description FRRouting FRR 7.5.1 through 9.0 and Pica8 PICOS 4.3.3.2 allow a remote attacker to cause a denial of service via a crafted BGP update with a corrupted attribute 23 (Tunnel Encapsulation). [Read the notes from the security team](https://ubuntu.com/security/CVE-2023-38802?format=md#notes) ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | frr | 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 8.4.2-1ubuntu1.3 | | 22.04 LTS jammy | Fixed 8.1-1ubuntu1.5 | | 20.04 LTS focal | Fixed 7.2.1-1ubuntu0.2+esm2 Ubuntu Pro | | 18.04 LTS bionic | Not in release | | 16.04 LTS xenial | Not in release | | 14.04 LTS trusty | Not in release | | quagga | 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 | | 22.04 LTS jammy | Not in release | | 20.04 LTS focal | Not affected | | 18.04 LTS bionic | Not affected | | 16.04 LTS xenial | Not affected | | 14.04 LTS trusty | Ignored end of standard support | --- * [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) * [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses) * [Patch details](https://ubuntu.com/security/CVE-2023-38802?format=md#patch-details) ### 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. Free for personal use. [Get Ubuntu Pro](https://ubuntu.com/pro) [30-day free trial](https://ubuntu.com/pro/free-trial) ## Notes --- ### [sbeattie](https://launchpad.net/~sbeattie) VINCE #1159 --- ### [eslerm](https://launchpad.net/~eslerm) frr merged patch on 2023-08-29 bcb6b58d9 ("bgpd: Use treat-as-withdraw for tunnel encapsulation attribute") quagga does not implement RFC 7606 --- ### [mdeslaur](https://launchpad.net/~mdeslaur) This was actually fixed in USN-6323-1, but was not listed because of a copy/paste error ### Patch details For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) | Package | Patch details | | --- | --- | | frr | * Upstream: [bcb6b58](https://github.com/FRRouting/frr/commit/bcb6b58d9530173df41d3a3cbc4c600ee0b4b186) | ## Severity score breakdown CVSS version: CVSS v3.0 **Base score** 7.5 · High * 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 | High | * Scores | Parameter | Value | | --- | --- | | Base score | 7.5 · High | | Exploitability score | - | | Impact score | - | **Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-38802) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2023-38802) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2023-38802) * [Debian](https://security-tracker.debian.org/tracker/CVE-2023-38802) ### Related Ubuntu Security Notices (USN) + [USN-6807-1](https://usn.ubuntu.com/USN-6807-1) + FRR vulnerabilities + 5 June 2024 ### Other references * * * *