CVE-2021-46900

Name: CVE-2021-46900
Creator: NVD / NIST
Published: 2023-12-31T05:15:08.04+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.37%

Last modified Jun 17, 2026

CVE-2021-46900 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Sympa before 6.2.62 relies on a cookie parameter for certain security objectives, but does not ensure that this parameter exists and has an unpredictable value. Specifically, the cookie parameter is both a salt for stored passwords and an XSS protection mechanism.. EPSS estimates a 0.37% chance of exploitation in the next 30 days.

Description

Sympa before 6.2.62 relies on a cookie parameter for certain security objectives, but does not ensure that this parameter exists and has an unpredictable value. Specifically, the cookie parameter is both a salt for stored passwords and an XSS protection mechanism.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.37%

28.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Sympa	Sympa	< 6.2.62

References

https://github.com/sympa-community/sympa-community.github.io/blob/master/security/2021-001.mdMitigation, Vendor Advisory
https://github.com/sympa-community/sympa/issues/1091Issue Tracking, Mitigation, Vendor Advisory
https://www.sympa.community/security/2021-001.htmlMitigation, Vendor Advisory
https://github.com/sympa-community/sympa-community.github.io/blob/master/security/2021-001.mdMitigation, Vendor Advisory
https://github.com/sympa-community/sympa/issues/1091Issue Tracking, Mitigation, Vendor Advisory
https://www.sympa.community/security/2021-001.htmlMitigation, Vendor Advisory

Timeline

Published: Dec 31, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-46900?

How severe is CVE-2021-46900?

CVE-2021-46900 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.37% probability of exploitation in the next 30 days.

How do I fix CVE-2021-46900?

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-2021-46900?

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

Scan your code now

Source: NVD / NIST