Is CVE-2021-46900 in the CISA KEV catalog?

No. CVE-2021-46900 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-46900?

CVE-2021-46900 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-46900?

CVE-2021-46900 has an EPSS score of 0.37% (29th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-46900?

Upgrade sympa on debian 12 to 6.2.66~dfsg-1 or later.

CVE & CISA-KEV Catalog

CVE-2021-46900

HIGH

7.5

CVSS v3

NVD

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.

CWE-327

How to fix

Remediation Available

sympaDebian

Fixed in:6.2.66~dfsg-1CVE-2021-46900

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.37%probability of exploitation in 30 days

29thpercentile

Low risk: more likely to be exploited than 29% of all known CVEs.

References

Vendor Advisory3

Related Vulnerabilities

Other CWE-327 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-2808	Low	3.7	74%	-	Fix
CVE-2023-34039	Critical	9.8	64%	-	Fix
CVE-2016-6602	Critical	9.8	55%	-	-
CVE-2014-8687	Critical	9.8	44%	-	-
CVE-2020-13777	High	7.4	18%	-	Fix
CVE-2017-17428	Medium	5.9	15%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-04-17.