Vulnerability Details : CVE-2021-3502
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.
Products affected by CVE-2021-3502
- cpe:2.3:a:avahi:avahi:0.8-5:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-3502
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 6 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-3502
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
2.1
|
LOW | AV:L/AC:L/Au:N/C:N/I:N/A:P |
3.9
|
2.9
|
NIST | |
|
5.5
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
1.8
|
3.6
|
NIST |
CWE ids for CVE-2021-3502
-
The product dereferences a pointer that it expects to be valid but is NULL.Assigned by: secalert@redhat.com (Primary)
-
The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.Assigned by: secalert@redhat.com (Primary)
References for CVE-2021-3502
-
https://github.com/lathiat/avahi/issues/338
reachable assertion in avahi_s_host_name_resolver_start when trying to resolve badly-formatted hostnames (CVE-2021-3502) · Issue #338 · lathiat/avahi · GitHubExploit;Third Party Advisory
-
https://bugzilla.redhat.com/show_bug.cgi?id=1946914
1946914 – (CVE-2021-3502) CVE-2021-3502 avahi: reachable assertion in avahi_s_host_name_resolver_start when trying to resolve badly-formatted hostnamesExploit;Issue Tracking;Patch;Third Party Advisory
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