CVE-2021-3502 — MEDIUM (5.5)

Vulnerability 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 Score

5.5

MEDIUM

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

Affected Products

Vendor	Product	Versions
Avahi	Avahi	0.8-5

Related Weaknesses (CWE)

CWE-617

References

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

FAQ

What is CVE-2021-3502?

CVE-2021-3502 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 t...

How severe is CVE-2021-3502?

CVE-2021-3502 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2021-3502?

Check the references section above for vendor advisories and patch information. Affected products include: Avahi Avahi.