CVE-2021-36781Public exploit

Local service impersonation via world-writable socket directory

Published Jan 14, 2022 · Updated Sep 16, 2024

Incorrect default permissions in the parsec package in openSUSE Factory before 0.8.1-1.1 allow local users to impersonate the service. Its systemd-tmpfiles rule creates /run/parsec with mode 0777, allowing any local user to replace the Unix-domain socket used by Parsec clients. The attacker needs only local code execution and can receive client requests through an imposter socket or prevent clients from reaching the legitimate service.

CVSS severity4.4
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect default permissions in the parsec package in openSUSE Factory before 0.8.1-1.1 allow local users to impersonate the service. Its systemd-tmpfiles rule creates /run/parsec with mode 0777, allowing any local user to replace the Unix-domain socket used by Parsec clients. The attacker needs only local code execution and can receive client requests through an imposter socket or prevent clients from reaching the legitimate service.

The record

CVE
CVE-2021-36781
Published
Jan 14, 2022
Updated
Sep 16, 2024
Vendor
OpenSUSE
Product
openSUSE Factory
Classifications
CWE-276, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 14, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=parsec <0.8.1-1.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

OpenSUSE · openSUSE Factoryversion=parsec <0.8.1-1.1

Published CVSS scores

4.4NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
5.9SUSECVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
3.6NVDAV:L/AC:L/Au:N/C:N/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-276Incorrect Default Permissions
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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