How severe is CVE-2021-46900?

CVE-2021-46900 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-46900 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-46900?

CVE-2021-46900 affects Sympa. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-46900?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-46900 published?

CVE-2021-46900 was published on 2023-12-31 and last updated on 2026-06-17.

CVE-2021-46900

CVE-2021-46900 is a high-severity vulnerability in Sympa with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-327.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-327
Affected product: Sympa
Published: 2023-12-31
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-46900?: 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.
How severe is CVE-2021-46900?: CVE-2021-46900 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-46900 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-46900?: CVE-2021-46900 affects Sympa. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-46900?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-46900 published?: CVE-2021-46900 was published on 2023-12-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:sympa:sympa:*:*:*:*:*:*:*:*

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