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Fencer Vulns
high 7.5

CVE-2021-27803 json

A vulnerability was discovered in how p2p/p2p_pd.c in wpa_supplicant before 2.10 processes P2P (Wi-Fi Direct) provision discovery requests.

published 2021-02-26 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-14544

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 69%
public exploits
0
none known

Summary

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.

Patch / fix

  • w1.fi wpa_supplicant 2.10
  • wpa Debian 14, Debian 13, Debian 12 2:2.9.0-21

debian advisories DEBIAN-CVE-2021-27803

  • wpa Ubuntu 16.04 LTS 2.4-0ubuntu6.8
  • wpa Ubuntu 18.04 LTS 2:2.6-15ubuntu2.8
  • wpa Ubuntu 20.04 LTS 2:2.9-1ubuntu4.3
  • wpa Ubuntu Pro 14.04 LTS 2.1-0ubuntu1.7+esm4

ubuntu advisories UBUNTU-CVE-2021-27803

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • wpa_supplicant RHEL 8 1:2.9-2.el8_3.1
  • wpa_supplicant RHEL 7 1:2.6-12.el7_9.2
  • wpa_supplicant RHEL 8.1 EUS 1:2.7-2.el8_1.1
  • wpa_supplicant RHEL 8.2 EUS 1:2.9-2.el8_2.1

red hat advisories RHSA-2021:0818RHSA-2021:0816RHSA-2021:0809RHSA-2021:0808

  • wpa_supplicant SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES for SAP 12 SP2 +11 more 2.6-15.16.1
  • wpa_supplicant SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +11 more 2.9-4.26.1
  • wpa_supplicant SLES for SAP 12 SP5, SLES 12 SP5 2.9-23.9.2

suse advisories SUSE-SU-2021:0745-1SUSE-SU-2021:0721-1SUSE-SU-2021:0720-1

  • wpa_supplicant openSUSE Tumbleweed 2.9-13.4
  • wpa_supplicant openSUSE Leap 15.2 2.9-lp152.8.9.1

opensuse advisories openSUSE-SU-2024:11515-1openSUSE-SU-2021:0404-1

  • wpa_supplicant Alpine 3.10 2.8-r5
  • wpa_supplicant Alpine 3.12, Alpine 3.11 2.9-r7
  • wpa_supplicant Alpine 3.13 2.9-r10
  • wpa_supplicant Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 2.9-r12

alpine advisories ALPINE-CVE-2021-27803

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • wpa_supplicant CBL-Mariner 2.0 2.9-4

azure linux advisories AZL-6973

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • wpa_supplicant Arch Linux 2:2.10-1

arch linux advisories AVG-1626

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-27803 updated cvss 7.5

wpa_supplicant: Use-after-free in P2P provision discovery processing

  • Red Hat Enterprise Linux BaseOS (v. 8) wpa_supplicant 2.9-2.el8_3.1
    fixed: vendor fix “Disable the P2P (control interface command "P2P_SET disabled 1" or "p2p_disabled=1" in (each, if multiple interfaces used) wpa_supplicant configuration file)” RHSA-2021:0809
  • Red Hat Enterprise Linux BaseOS EUS (v. 8.1) wpa_supplicant 2.7-2.el8_1.1
    fixed: vendor fix “Disable the P2P (control interface command "P2P_SET disabled 1" or "p2p_disabled=1" in (each, if multiple interfaces used) wpa_supplicant configuration file)” RHSA-2021:0818
  • Red Hat Enterprise Linux BaseOS EUS (v. 8.2) wpa_supplicant 2.9-2.el8_2.1
    fixed: vendor fix “Disable the P2P (control interface command "P2P_SET disabled 1" or "p2p_disabled=1" in (each, if multiple interfaces used) wpa_supplicant configuration file)” RHSA-2021:0816
  • Red Hat Enterprise Linux Client (v. 7) wpa_supplicant 2.6-12.el7_9.2 Red Hat Enterprise Linux Server (v. 7) wpa_supplicant 2.6-12.el7_9.2 Red Hat Enterprise Linux Workstation (v. 7) wpa_supplicant 2.6-12.el7_9.2
    fixed: vendor fix “Disable the P2P (control interface command "P2P_SET disabled 1" or "p2p_disabled=1" in (each, if multiple interfaces used) wpa_supplicant configuration file)” RHSA-2021:0808
  • Red Hat Enterprise Linux 6 wpa_supplicant Red Hat Enterprise Linux 9 wpa_supplicant
    not affected: vulnerable code not present “Disable the P2P (control interface command "P2P_SET disabled 1" or "p2p_disabled=1" in (each, if multiple interfaces used) wpa_supplicant configuration file)”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
10 mo ago

Exploit prediction

1.23% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.5 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 7.5 CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 5.4 AV:A/AC:M/Au:N/C:P/I:P/A:P

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.