CVE-2021-3502

MEDIUM
Published May 7, 20215y ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published May 7, 2021 5y ago
Last Modified Jun 17, 2026 2w ago

Description

A flaw was found in avahi 0.8-5. A reachable assertion is present in avahi_s_host_name_resolver_start function allowing a local attacker to crash the avahi service by requesting hostname resolutions through the avahi socket or dbus methods for invalid hostnames. The highest threat from this vulnerability is to the service availability.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

No active exploitation signals — not in CISA KEV and no EPSS score yet.

Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-617

Affected Products 1

VendorProductVersionRange
avahiavahi0.8-5any

References 2

  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=1946914
    ExploitIssue TrackingPatchThird Party Advisory
  • github.com https://github.com/lathiat/avahi/issues/338
    ExploitThird Party Advisory

Remediation

  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=1946914
    ExploitIssue TrackingPatchThird Party Advisory