CVE-2021-26120: debian debian_linux Code Injection
CVSS: 9.8v3.1CriticalModified
AliasesUBUNTU-CVE-2021-26120DEBIAN-CVE-2021-26120
Published 22-02-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-26120 is a critical (CVSS 9.8) Code Injection vulnerability in debian debian_linux. EPSS estimates a 82.32% chance of exploitation in the next 30 days, higher than 99.6% of scored vulnerabilities.
CVSS score
9.8/10
010
Critical · v3.1 (NVD)EPSS score
82.32%
0%100%
Critical · 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 6 · Related 3Timeline
- 22-02-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
Smarty before 3.1.39 allows code injection via an unexpected function name after a {function name= substring.
CVSS metrics
4 scores · 3 sources · 2 versionsCritical 9.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
High 7.5Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
82.32%
Chance of exploitation in the next 30 days
Percentile
100%
Versus all other CVEs
30-day change
0.00 pp
From 82.32% on 20-09-2026
20-09-202620-10-2026
EPSS score82.32%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian2 products
- smarty3< 3.1.39-1
- debian_linuxEOL9.0 | 10.0 | 11.0
Smarty1 product
- smarty< 3.1.39
Ubuntu1 product
- smarty3< 3.1.21-1ubuntu1+esm1 | < 3.1.31+20161214.1.c7d42e4+selfpack1-3ubuntu0.1 | < 3.1.34+20190228.1.c9f0de05+selfpack1-1ubuntu0.1~esm1
3 vendors · 4 products
References
11 links- github.com/smarty-php/smarty/blob/master/CHANGELOG.mdX Refsource MISCREPORTRelease NotesThird Party Advisory
lists.debian.org/debian-lts-announce/2021/04/msg00004.htmlMailing ListX Refsource MLISTThird Party Advisory- lists.debian.org/debian-lts-announce/2021/04/msg00014.htmlMailing ListX Refsource MLISTThird Party Advisory