# CVE-2021-3677: Information disclosure in postgresql > An authenticated database user can read arbitrary server memory bytes via a crafted query, exposing sensitive data. - **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`) - **Exploited in the wild:** Not known - **Login needed:** Any signed-in user - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 2 Mar 2022 - **Updated:** 3 Aug 2024 - **Also known as:** ALPINE-CVE-2021-3677, AZL-8902, BIT-postgresql-2021-3677, CLEANSTART-2026-SE93018, DEBIAN-CVE-2021-3677, ECHO-31f9-f40e-d8e6, GHSA-j859-w9g7-8276, JLSEC-2026-35, MGASA-2021-0424, RHSA-2022:4931, SUSE-SU-2021:3119-1, SUSE-SU-2021:3120-1, SUSE-SU-2021:3255-1, SUSE-SU-2021:3256-1, UBUNTU-CVE-2021-3677, openSUSE-SU-2021:3255-1, openSUSE-SU-2021:3256-1 ## What is CVE-2021-3677? CVE-2021-3677 is a medium-severity vulnerability in Fedoraproject Fedora, published on 2 Mar 2022. Any signed-in user can exploit it over the network, with no action from the victim. ### Official description A flaw was found in postgresql. A purpose-crafted query can read arbitrary bytes of server memory. In the default configuration, any authenticated database user can complete this attack at will. The attack does not require the ability to create objects. If server settings include max_worker_processes=0, the known versions of this attack are infeasible. However, undiscovered variants of the attack may be independent of that setting. Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) ## Which versions are affected by CVE-2021-3677? 1 open source package ship an affected version, including postgresql. It affects 7 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `postgresql` | Bitnami | From 11.0.0 | 11.13.0, 12.8.0, 13.4.0 | | `rhvm-appliance` | Red Hat:rhev_hypervisor:4.4::el8 | All versions | 2:4.5-20220603.1.el8ev | | `postgresql12` | SUSE:Linux Enterprise Module for Basesystem 15 SP2 | All versions | 12.8-8.23.2 | | `postgresql13` | SUSE:Linux Enterprise Module for Basesystem 15 SP2 | All versions | 13.4-5.16.2 | | `postgresql13` | SUSE:Linux Enterprise Module for Basesystem 15 SP3 | All versions | 13.4-5.16.2 | | `postgresql12` | SUSE:Linux Enterprise Module for Legacy 15 SP3 | All versions | 12.8-8.23.2 | | `postgresql13` | SUSE:Linux Enterprise Module for Package Hub 15 SP2 | All versions | 13.4-5.16.2 | | `postgresql13` | SUSE:Linux Enterprise Module for Package Hub 15 SP3 | All versions | 13.4-5.16.2 | | `postgresql12` | SUSE:Linux Enterprise Module for Server Applications 15 SP2 | All versions | 12.8-8.23.2 | | `postgresql13` | SUSE:Linux Enterprise Module for Server Applications 15 SP2 | All versions | 13.4-5.16.2 | | `postgresql13` | SUSE:Linux Enterprise Module for Server Applications 15 SP3 | All versions | 13.4-5.16.2 | | `postgresql12` | SUSE:Linux Enterprise Server 12 SP5 | All versions | 12.8-3.18.2 | | `postgresql13` | SUSE:Linux Enterprise Server 12 SP5 | All versions | 13.4-3.12.2 | | `postgresql12` | SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | All versions | 12.8-3.18.2 | | `postgresql13` | SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | All versions | 13.4-3.12.2 | | `postgresql12` | SUSE:Linux Enterprise Software Development Kit 12 SP5 | All versions | 12.8-3.18.2 | | `postgresql13` | SUSE:Linux Enterprise Software Development Kit 12 SP5 | All versions | 13.4-3.12.2 | | `postgresql12` | openSUSE:Leap 15.3 | All versions | 12.8-8.23.2 | | `postgresql13` | openSUSE:Leap 15.3 | All versions | 13.4-5.16.2 | Products: Fedoraproject Fedora, Postgresql Postgresql, Redhat Enterprise Linux, Redhat Enterprise Linux for Ibm Z Systems, Redhat Enterprise Linux for Power Little Endian, Redhat Software Collections, Redhat Virtualization. ## How do I fix CVE-2021-3677? Upgrade postgresql to a fixed version for your release line: 11.13.0, 12.8.0 or 13.4.0. ## Is CVE-2021-3677 being exploited? There is no known exploitation of CVE-2021-3677 in the wild and no public exploit code. ## Other vulnerabilities in Fedoraproject Fedora - [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild) - [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild) - [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild) - [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild) - [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2021-3677 and fix it if it is affected. What it is: CVE-2021-3677 is a medium-severity vulnerability in Fedoraproject Fedora, published on 2 Mar 2022. Any signed-in user can exploit it over the network, with no action from the victim. Exploitation: There is no known exploitation of CVE-2021-3677 in the wild and no public exploit code. Affected packages and fixed versions: - postgresql (Bitnami): affected from 11.0.0; fixed in 11.13.0, 12.8.0, 13.4.0 Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2021-3677/ (Markdown: https://insights.sbomify.com/CVE-2021-3677/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2021-3677 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-3677 - OSV: https://osv.dev/vulnerability/CVE-2021-3677 --- From sbomify Insights: https://insights.sbomify.com/CVE-2021-3677/ Summaries are generated and may contain mistakes; the official description above is the record.