Vulnerability in Avahi
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (28.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 28.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Avahi — versions 0.8-5
- Avahi — versions 0.8-5
Weakness classification (CWE)
References
- bugzilla.redhat.com/show_bug.cgi (Exploit, Patch, Third Party Advisory, Issue Tracking)
- github.com/lathiat/avahi/issues/338 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-3502?
- CVE-2021-3502 is a medium-severity vulnerability in Avahi, classified under Reachable Assertion. CVSS score: 5.5/10. Published 2021-05-07.
- How severe is CVE-2021-3502?
- Medium severity. CVSS v3 base score is 5.5 out of 10.