CVE-2021-46900: Sympa before 6.2.62 relies on a cookie parameter for certain security objectives, but does not ensure that thi

Q: How do I fix CVE-2021-46900?

sympa: upgrade to 6.2.62. Exact commands for each OS are on this page.

Q: Is CVE-2021-46900 being exploited?

CVE-2021-46900 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-46900 affect?

CVE-2021-46900 affects sympa. Severity is high (CVSS 7.5). 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 X

Q: How urgent is CVE-2021-46900?

Priority 39/100. High severity; Remotely exploitable, no login, no user action

Routine

HIGH 7.5REMOTEUPGRADE

CVE-2021-46900 is a high-severity flaw (CVSS 7.5) affecting sympa. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-327
Published	2023-12-31
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: sympa

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-12-31 05:15 UTCPublished CVE record published
2026-06-17 04:15 UTCUpdated Record last modified

sympa sympa UPGRADE

Affected: < 6.2.62

Fixed in: 6.2.62

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy sympa || rpm -q sympa || sympa --version

2. UPGRADE to 6.2.62 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade sympa

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sympa

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-46900?

sympa: upgrade to 6.2.62. Exact commands for each OS are on this page.

Is CVE-2021-46900 being exploited?

CVE-2021-46900 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-46900 affect?

CVE-2021-46900 affects sympa. Severity is high (CVSS 7.5). 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 X

How urgent is CVE-2021-46900?

Priority 39/100. High severity; Remotely exploitable, no login, no user action

References

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