CVE-2021-32539: Add event in calendar function in the 101EIP system does not filter special characters in specific fields, whi

Routine

MEDIUM 5.4DOWNGRADE

CVE-2021-32539 is a medium-severity flaw (CVSS 5.4) affecting 101eip. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Add event in calendar function in the 101EIP system does not filter special characters in specific fields, which allows remote authenticated users to inject JavaScript and perform a stored XSS attack.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-05-28
Last modified	2026-06-17

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

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

hundredplus 101eip DOWNGRADE

Affected: 200925

Fixed in: no fixed release known

Safe to downgrade to: a release before 200925

1. Check installed version

apt-cache policy 101eip || rpm -q 101eip || 101eip --version

2. No fixed release: DOWNGRADE to a release before 200925 (Debian / Ubuntu)

apt-cache madison 101eip sudo apt install 101eip=<VERSION_BEFORE_200925> sudo apt-mark hold 101eip

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list 101eip sudo dnf downgrade 101eip-<VERSION_BEFORE_200925> sudo dnf versionlock add 101eip

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2021-32539?

101eip: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-32539 being exploited?

CVE-2021-32539 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-2021-32539 affect?

CVE-2021-32539 affects 101eip. Severity is medium (CVSS 5.4). Add event in calendar function in the 101EIP system does not filter special characters in specific fields, which allows remote authenticated users to inject JavaScript and perform a stored XSS attack.

How urgent is CVE-2021-32539?

Priority 31/100. No elevated risk signals yet.

Related CVEs

CVE-2021-32540 MEDIUM 5.4 DOWNGRADE Add announcement function in the 101EIP system does not filter special characters, which allows authenticated

References

← Back to latest CVEs