CVE-2021-32541: The CTS Web transaction system related to authentication and session management is implemented incorrectly, wh

Q: How do I fix CVE-2021-32541?

cts web: upgrade to 2021.3.24. Exact commands for each OS are on this page.

Q: Is CVE-2021-32541 being exploited?

CVE-2021-32541 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-2021-32541 affect?

CVE-2021-32541 affects cts web. Severity is medium (CVSS 5.3). The CTS Web transaction system related to authentication and session management is implemented incorrectly, which allows remote unauthenticated attackers can send a large number of valid usernames, and force those logged-in account to log o

Q: How urgent is CVE-2021-32541?

Priority 42/100. Remotely exploitable, no login, no user action

This month

MEDIUM 5.3REMOTEUPGRADE

CVE-2021-32541 is a medium-severity flaw (CVSS 5.3) affecting cts web. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The CTS Web transaction system related to authentication and session management is implemented incorrectly, which allows remote unauthenticated attackers can send a large number of valid usernames, and force those logged-in account to log out, causing the user to be unable to access the services

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-287
Published	2021-05-28
Last modified	2026-06-17

Publisher (CNA): TWCERT/CC · Vendor: sysjust

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

Am I affected?

Timeline

2021-05-28 08:15 UTCPublished CVE record published
2026-06-17 03:53 UTCUpdated Record last modified

sysjust cts web UPGRADE

Affected: < 2021.3.24

Fixed in: 2021.3.24

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy cts-web || rpm -q cts-web || cts-web --version

2. UPGRADE to 2021.3.24 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cts-web

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cts-web

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-2021-32541?

cts web: upgrade to 2021.3.24. Exact commands for each OS are on this page.

Is CVE-2021-32541 being exploited?

CVE-2021-32541 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-2021-32541 affect?

CVE-2021-32541 affects cts web. Severity is medium (CVSS 5.3). The CTS Web transaction system related to authentication and session management is implemented incorrectly, which allows remote unauthenticated attackers can send a large number of valid usernames, and force those logged-in account to log o

How urgent is CVE-2021-32541?

Priority 42/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-32543 MEDIUM 6.5 UPGRADE The CTS Web transaction system related to authentication management is implemented incorrectly
CVE-2021-32542 MEDIUM 4.7 UPGRADE The parameters of the specific functions in the CTS Web trading system do not filter special characters, which

References

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