RCE in Smarty

CVE-2021-26120

Smarty before 3.1.39 allows code injection via an unexpected function name after a {function name= substring.

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.823 (99.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

  • cve@mitre.org (Third Party Advisory, x_refsource_MISC, Release Notes)
  • cve@mitre.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
  • cve@mitre.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
  • cve@mitre.org (vendor-advisory, Patch, Third Party Advisory, x_refsource_GENTOO)
  • cve@mitre.org (vendor-advisory, Third Party Advisory, x_refsource_DEBIAN)

Frequently asked questions

What is CVE-2021-26120?
CVE-2021-26120 is a critical-severity vulnerability in Smarty, classified under Code Injection. CVSS score: 9.8/10. Published 2021-02-22.
How severe is CVE-2021-26120?
Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-26120 known to be exploited?
6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.