CVE-2022-4891

Name: CVE-2022-4891
Creator: NVD / NIST
Published: 2023-01-17T20:15:11.757+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.34%

Last modified Jun 17, 2026

CVE-2022-4891 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A vulnerability has been found in Sisimai up to 4.25.14p11 and classified as problematic. This vulnerability affects the function to_plain of the file lib/sisimai/string.rb. EPSS estimates a 1.34% chance of exploitation in the next 30 days.

Description

A vulnerability has been found in Sisimai up to 4.25.14p11 and classified as problematic. This vulnerability affects the function to_plain of the file lib/sisimai/string.rb. The manipulation leads to inefficient regular expression complexity. The exploit has been disclosed to the public and may be used. Upgrading to version 4.25.14p12 is able to address this issue. The name of the patch is 51fe2e6521c9c02b421b383943dc9e4bbbe65d4e. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-218452.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.34%

67.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1333

Affected Software

Vendor	Product	Versions
Libsisimai	Sisimai	< 4.25.14
Libsisimai	Sisimai	4.25.14

References

https://gist.githubusercontent.com/gmcabrita/e5dc0332473fc2e3a7a407434c8d21c7/raw/00b12035e5e1b685469f143b94301a50306376ba/example.htmlExploit, Third Party Advisory
https://github.com/sisimai/rb-sisimai/commit/51fe2e6521c9c02b421b383943dc9e4bbbe65d4ePatch, Third Party Advisory
https://github.com/sisimai/rb-sisimai/pull/244Exploit, Patch, Third Party Advisory
https://github.com/sisimai/rb-sisimai/releases/tag/v4.25.14p12Release Notes, Third Party Advisory
https://vuldb.com/?ctiid.218452Permissions Required, Third Party Advisory
https://vuldb.com/?id.218452Permissions Required, Third Party Advisory
https://gist.githubusercontent.com/gmcabrita/e5dc0332473fc2e3a7a407434c8d21c7/raw/00b12035e5e1b685469f143b94301a50306376ba/example.htmlExploit, Third Party Advisory
https://github.com/sisimai/rb-sisimai/commit/51fe2e6521c9c02b421b383943dc9e4bbbe65d4ePatch, Third Party Advisory
https://github.com/sisimai/rb-sisimai/pull/244Exploit, Patch, Third Party Advisory
https://github.com/sisimai/rb-sisimai/releases/tag/v4.25.14p12Release Notes, Third Party Advisory
https://vuldb.com/?ctiid.218452Permissions Required, Third Party Advisory
https://vuldb.com/?id.218452Permissions Required, Third Party Advisory

Timeline

Published: Jan 17, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-4891?

How severe is CVE-2022-4891?

CVE-2022-4891 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.34% probability of exploitation in the next 30 days.

How do I fix CVE-2022-4891?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-4891?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST