CVE-2021-44730: canonical ltd. snapd Link Following
CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2021-44730DEBIAN-CVE-2021-44730
Published 17-02-2022Last modified 04-08-2024
Vulnerability summary
CVE-2021-44730 is a high (CVSS 8.8) Link Following vulnerability in canonical ltd. snapd. EPSS estimates a 0.35% chance of exploitation in the next 30 days, higher than 27.1% of scored vulnerabilities.
CVSS score
8.8/10
010
High · v3.1 (NVD)EPSS score
0.35%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 4 · Related 3Timeline
- 17-02-2022PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
snapd 2.54.2 did not properly validate the location of the snap-confine binary. A local attacker who can hardlink this binary to another location to cause snap-confine to execute other arbitrary binaries and hence gain privilege escalation. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1
CVSS metrics
5 scores · 4 sources · 2 versionsHigh 8.8Preferred score · NVD (NIST)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:HSources4 sources · 7.8–8.8
- CVE.orgCNA7.8HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Medium 6.9Preferred score · NVD (NIST)
AV:L/AC:M/Au:N/C:C/I:C/A:CSourcesSingle source
EPSS trend
Probability
0.35%
Chance of exploitation in the next 30 days
Percentile
27%
Versus all other CVEs
30-day change
0.00 pp
From 0.35% on 18-09-2026
18-09-202618-10-2026
EPSS score0.35%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Canonical2 products
- snapd≤ 2.54.2
- ubuntu_linuxEOL18.04 | 20.04 | 21.10
Debian2 products
- snapd< 2.54.3-1
- debian_linuxEOL10.0 | 11.0
Canonical ltd.1 product
- snapd≥ unspecified, ≤ 2.54.2
Fedoraproject1 product
- fedoraEOL34 | 35
Ubuntu1 product
- snapd< 2.54.3+14.04~esm1 | < 2.54.3+16.04~esm2 | < 2.54.3+18.04 | < 2.54.3+20.04.1
5 vendors · 7 products
References
13 links
www.debian.org/security/2022/dsa-5080Vendor AdvisoryX Refsource DEBIANIssue TrackingThird Party Advisory