# CVE-2021-27803: Memory corruption in n/a > An attacker within radio range can cause denial of service or execute arbitrary code via malicious P2P provision discovery requests in wpa_supplicant. - **Severity:** High 7.5 (`CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Local or same network only - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 26 Feb 2021 - **Updated:** 18 Dec 2025 - **Also known as:** ALPINE-CVE-2021-27803, AZL-6973, DEBIAN-CVE-2021-27803, DLA-2581-1, GHSA-66mx-93rr-rg39, MGASA-2021-0095, OESA-2021-1133, RHSA-2021:0808, RHSA-2021:0809, RHSA-2021:0816, RHSA-2021:0818, SUSE-SU-2021:0720-1, SUSE-SU-2021:0721-1, SUSE-SU-2021:0745-1, UBUNTU-CVE-2021-27803, USN-4757-1, USN-4757-2, openSUSE-SU-2021:0404-1 ## What is CVE-2021-27803? CVE-2021-27803 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 26 Feb 2021. It can only be exploited from the same machine or local network, with no action from the victim. ### Official description A vulnerability was discovered in how p2p/p2p_pd.c in wpa_supplicant before 2.10 processes P2P (Wi-Fi Direct) provision discovery requests. It could result in denial of service or other impact (potentially execution of arbitrary code), for an attacker within radio range. ## Which versions are affected by CVE-2021-27803? It affects 3 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `wpa_supplicant` | Red Hat:enterprise_linux:7::client | All versions | 1:2.6-12.el7_9.2 | | `wpa_supplicant-debuginfo` | Red Hat:enterprise_linux:7::client | All versions | 1:2.6-12.el7_9.2 | | `wpa_supplicant` | Red Hat:enterprise_linux:7::server | All versions | 1:2.6-12.el7_9.2 | | `wpa_supplicant-debuginfo` | Red Hat:enterprise_linux:7::server | All versions | 1:2.6-12.el7_9.2 | | `wpa_supplicant` | Red Hat:enterprise_linux:7::workstation | All versions | 1:2.6-12.el7_9.2 | | `wpa_supplicant-debuginfo` | Red Hat:enterprise_linux:7::workstation | All versions | 1:2.6-12.el7_9.2 | | `wpa_supplicant` | Red Hat:enterprise_linux:8::baseos | All versions | 1:2.9-2.el8_3.1 | | `wpa_supplicant-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 1:2.9-2.el8_3.1 | | `wpa_supplicant-debugsource` | Red Hat:enterprise_linux:8::baseos | All versions | 1:2.9-2.el8_3.1 | | `wpa_supplicant` | Red Hat:rhel_eus:8.1::baseos | All versions | 1:2.7-2.el8_1.1 | | `wpa_supplicant-debuginfo` | Red Hat:rhel_eus:8.1::baseos | All versions | 1:2.7-2.el8_1.1 | | `wpa_supplicant-debugsource` | Red Hat:rhel_eus:8.1::baseos | All versions | 1:2.7-2.el8_1.1 | | `wpa_supplicant` | Red Hat:rhel_eus:8.2::baseos | All versions | 1:2.9-2.el8_2.1 | | `wpa_supplicant-debuginfo` | Red Hat:rhel_eus:8.2::baseos | All versions | 1:2.9-2.el8_2.1 | | `wpa_supplicant-debugsource` | Red Hat:rhel_eus:8.2::baseos | All versions | 1:2.9-2.el8_2.1 | | `wpa_supplicant` | SUSE:Enterprise Storage 6 | All versions | 2.9-4.26.1 | | `wpa_supplicant` | SUSE:HPE Helion OpenStack 8 | All versions | 2.6-15.16.1 | | `wpa_supplicant` | SUSE:Linux Enterprise High Performance Computing 15 SP1-ESPOS | All versions | 2.9-4.26.1 | | `wpa_supplicant` | SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS | All versions | 2.9-4.26.1 | | `wpa_supplicant` | SUSE:Linux Enterprise High Performance Computing 15-ESPOS | All versions | 2.9-4.26.1 | | `wpa_supplicant` | SUSE:Linux Enterprise High Performance Computing 15-LTSS | All versions | 2.9-4.26.1 | | `wpa_supplicant` | SUSE:Linux Enterprise Module for Basesystem 15 SP2 | All versions | 2.9-4.26.1 | | `wpa_supplicant` | SUSE:Linux Enterprise Server 12 SP2-BCL | All versions | 2.6-15.16.1 | | `wpa_supplicant` | SUSE:Linux Enterprise Server 12 SP2-LTSS | All versions | 2.6-15.16.1 | | `wpa_supplicant` | SUSE:Linux Enterprise Server 12 SP3-BCL | All versions | 2.6-15.16.1 | | `wpa_supplicant` | SUSE:Linux Enterprise Server 12 SP3-LTSS | All versions | 2.6-15.16.1 | | `wpa_supplicant` | SUSE:Linux Enterprise Server 12 SP4-LTSS | All versions | 2.6-15.16.1 | | `wpa_supplicant` | SUSE:Linux Enterprise Server 12 SP5 | All versions | 2.9-23.9.2 | | `wpa_supplicant` | SUSE:Linux Enterprise Server 15 SP1-BCL | All versions | 2.9-4.26.1 | | `wpa_supplicant` | SUSE:Linux Enterprise Server 15 SP1-LTSS | All versions | 2.9-4.26.1 | | `wpa_supplicant` | SUSE:Linux Enterprise Server 15-LTSS | All versions | 2.9-4.26.1 | | `wpa_supplicant` | SUSE:Linux Enterprise Server for SAP Applications 12 SP2 | All versions | 2.6-15.16.1 | | `wpa_supplicant` | SUSE:Linux Enterprise Server for SAP Applications 12 SP3 | All versions | 2.6-15.16.1 | | `wpa_supplicant` | SUSE:Linux Enterprise Server for SAP Applications 12 SP4 | All versions | 2.6-15.16.1 | | `wpa_supplicant` | SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | All versions | 2.9-23.9.2 | | `wpa_supplicant` | SUSE:Linux Enterprise Server for SAP Applications 15 | All versions | 2.9-4.26.1 | | `wpa_supplicant` | SUSE:Linux Enterprise Server for SAP Applications 15 SP1 | All versions | 2.9-4.26.1 | | `wpa_supplicant` | SUSE:Manager Proxy 4.0 | All versions | 2.9-4.26.1 | | `wpa_supplicant` | SUSE:Manager Retail Branch Server 4.0 | All versions | 2.9-4.26.1 | | `wpa_supplicant` | SUSE:Manager Server 4.0 | All versions | 2.9-4.26.1 | Products: Debian Debian Linux, Fedoraproject Fedora, W1.fi Wpa Supplicant. ## How do I fix CVE-2021-27803? Upgrade to a fixed version. ## Is CVE-2021-27803 being exploited? There is no known exploitation of CVE-2021-27803 in the wild and no public exploit code. ## Other vulnerabilities in Debian Debian Linux - [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild) - [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild) - [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild) - [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild) - [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2021-27803 and fix it if it is affected. What it is: CVE-2021-27803 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 26 Feb 2021. It can only be exploited from the same machine or local network, with no action from the victim. Exploitation: There is no known exploitation of CVE-2021-27803 in the wild and no public exploit code. Affected product: Debian Debian Linux. No package-level version data is available, so check the vendor advisory linked from the reference page. 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-2021-27803/ (Markdown: https://insights.sbomify.com/CVE-2021-27803/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2021-27803 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-27803 - OSV: https://osv.dev/vulnerability/CVE-2021-27803 --- From sbomify Insights: https://insights.sbomify.com/CVE-2021-27803/ Summaries are generated and may contain mistakes; the official description above is the record.