CVE-2021-21408

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

2.22% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 81.1% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

CVSS:3.1/AV:N/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

2022-01-10 00:00Z4 YR AGO

Last updated

2025-04-23 19:14Z1 YR AGO

Reserved

2020-12-22

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 8.8)

CNA CVSS vector

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

Weaknesses

• CWE-20Improper Input ValidationClass

Data version

5.1

Document digest

c98e94bc15497e71e7f2ce62ed7c9c9774459598d812ec168827c3c5328cf19a

• github.comhttps://github.com/smarty-php/smarty/security/advisories/GHSA-4h9c-v5vg-5m6m
• github.comhttps://github.com/smarty-php/smarty/commit/19ae410bf56007a5ef24441cdc6414619cfaf664
• github.comhttps://github.com/smarty-php/smarty/releases/tag/v3.1.43
• github.comhttps://github.com/smarty-php/smarty/releases/tag/v4.0.3
• lists.debian.org[debian-lts-announce] 20220505 [SECURITY] [DLA 2995-1] smarty3 security updatehttps://lists.debian.org/debian-lts-announce/2022/05/msg00005.htmlmailing-list
• www.debian.orgDSA-5151https://www.debian.org/security/2022/dsa-5151vendor-advisory
• security.gentoo.orgGLSA-202209-09https://security.gentoo.org/glsa/202209-09vendor-advisory
• lists.fedoraproject.orgFEDORA-2022-52154efd61https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L777JIBIWJV34HS7LXPIDWASG7TT4LNI/vendor-advisory
• lists.fedoraproject.orgFEDORA-2022-d5fc9dcdd7https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BRAJVDRGCIY5UZ2PQHKDTT7RMKG6WJQQ/vendor-advisory