CVE-2021-26720

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

0.40% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 32.6% of scored records. A rank, not a probability.

NVD base score

7.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-02-17 21:19Z5 YR AGO

Last updated

2024-08-03 20:33Z2 YR AGO

Reserved

2021-02-05

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-59Improper Link Resolution Before File Access ('Link Following')Base

Data version

5.1

Document digest

065d2b5976a1aa6b226acb7541e044ab476a39e61a352ef9d97961d008db01c9

• packages.debian.orghttps://packages.debian.org/buster/avahi-daemonx_refsource_MISC
• packages.debian.orghttps://packages.debian.org/sid/avahi-daemonx_refsource_MISC
• packages.debian.orghttps://packages.debian.org/bullseye/avahi-daemonx_refsource_MISC
• security-tracker.debian.orghttps://security-tracker.debian.org/tracker/CVE-2021-26720x_refsource_MISC
• bugs.launchpad.nethttps://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824x_refsource_MISC
• metadata.ftp-master.debian.orghttps://metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changelogx_refsource_MISC
• www.openwall.comhttps://www.openwall.com/lists/oss-security/2021/02/15/2x_refsource_MISC
• bugs.debian.orghttps://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982796x_refsource_MISC
• bugzilla.suse.comhttps://bugzilla.suse.com/show_bug.cgi?id=1180827x_refsource_MISC
• lists.debian.org[debian-lts-announce] 20220607 [SECURITY] [DLA 3047-1] avahi security updatehttps://lists.debian.org/debian-lts-announce/2022/06/msg00009.htmlmailing-listx_refsource_MLIST