CVE-2021-23239: debian debian_linux Link Following
CVSS: 2.5v3.1LowModified
AliasesALPINE-CVE-2021-23239UBUNTU-CVE-2021-23239DEBIAN-CVE-2021-23239DLA-3181-1
Published 12-01-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-23239 is a low (CVSS 2.5) Link Following vulnerability in debian debian_linux. EPSS estimates a 1.04% chance of exploitation in the next 30 days, higher than 63.5% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
2.5/10
010
Low · v3.1 (NVD)EPSS score
1.04%
0%100%
Low · +0.01 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Advisory lineage
Upstream 0 · Downstream 10 · Related 8Timeline
- 12-01-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
The sudoedit personality of Sudo before 1.9.5 may allow a local unprivileged user to perform arbitrary directory-existence tests by winning a sudo_edit.c race condition in replacing a user-controlled directory by a symlink to an arbitrary path.
CVSS metrics
5 scores · 4 sources · 2 versionsLow 2.5Preferred score · NVD (NIST)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:NSourcesAll 4 agree
- OSV · AlpineEcosystem advisory · calculated2.5LowCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
- OSV · UbuntuEcosystem advisory · calculated2.5LowCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
- OSV · DebianEcosystem advisory · calculated2.5LowCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Low 1.9Preferred score · NVD (NIST)
AV:L/AC:M/Au:N/C:P/I:N/A:NSourcesSingle source
EPSS trend
Probability
1.04%
Chance of exploitation in the next 30 days
Percentile
64%
Versus all other CVEs
30-day change
+0.01 pp
From 1.03% on 19-09-2026
19-09-202619-10-2026
EPSS score1.04%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (bugzilla.suse.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Netapp3 products
Debian2 products
- sudo< 1.9.5-1 | < 1.8.27-1+deb10u4
- debian_linuxEOL10.0
Alpine1 product
- sudo≥ 1.9.0, < 1.9.5p2-r0 | ≥ 1.9.0, < 1.9.5-r0
Fedoraproject1 product
- fedoraEOL32 | 33
Sudo_project1 product
- sudo< 1.8.32 | ≥ 1.9.0, < 1.9.5
Ubuntu1 product
- sudoAll versions (No fix recorded) | < 1.8.16-0ubuntu1.10 | < 1.8.21p2-3ubuntu1.4 | < 1.8.31-1ubuntu1.2
6 vendors · 9 products
References
14 links- lists.fedoraproject.org/archives/…Vendor Advisory
- lists.fedoraproject.org/archives/…Vendor Advisory
- security.netapp.com/advisory/ntap-20210129-0010/Third Party Advisory
