CVE-2021-26720 — Vulnetix

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CVE-2021-26720 PUBLISHED

avahi-daemon-check-dns.sh in the Debian avahi package through 0.8-4 is executed as root via /etc/network/if-up.d/avahi-daemon, and allows a local attacker to cause a denial of service or create arbitrary empty files via a symlink attack on files under /run/avahi-daemon. NOTE: this only affects the packaging for Debian GNU/Linux (used indirectly by SUSE), not the upstream Avahi product.

EPSS 0.07% · 21.0th percentile

Risk Scores

EPSS Score

0.07%

21.0th percentile

Affected Products

Vendor	Product	Versions
Ubuntu:Pro:18.04:LTS	avahi	0, 0.7-3.1ubuntu1.3+esm3, 0.7-3.1ubuntu1.3+esm2
Ubuntu:Pro:16.04:LTS	avahi	0.6.32~rc+dfsg-1ubuntu2.2, 0, 0.6.31-4ubuntu4
Ubuntu:Pro:14.04:LTS	avahi	0.6.31-2ubuntu4, 0.6.31-4ubuntu1.3+esm4, 0.6.31-4ubuntu1.3+esm3

Timeline

Feb 17, 2021 CVE Published
Apr 14, 2021 EPSS Score
Jun 22, 2021 EPSS Score
Aug 23, 2021 EPSS Score
Oct 24, 2021 EPSS Score
Jan 6, 2022 EPSS Score
Feb 4, 2022 EPSS Score
Feb 25, 2022 EPSS Score
Apr 1, 2022 EPSS Score
Apr 28, 2022 EPSS Score
Jun 29, 2022 EPSS Score
Aug 31, 2022 EPSS Score

References

https://ubuntu.com/security/CVE-2021-26720 third-party-advisory
https://www.openwall.com/lists/oss-security/2021/02/15/2 third-party-advisory
https://www.cve.org/CVERecord?id=CVE-2021-26720 third-party-advisory

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