CVE-2021-42558: An issue was discovered in CALDERA 2.8.1

Q: How do I fix CVE-2021-42558?

caldera: upgrade to newer than 2.8.1. Exact commands for each OS are on this page.

Q: Is CVE-2021-42558 being exploited?

CVE-2021-42558 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-2021-42558 affect?

CVE-2021-42558 affects caldera. Severity is medium (CVSS 6.1). An issue was discovered in CALDERA 2.8.1. It contains multiple reflected, stored, and self XSS vulnerabilities that may be exploited by authenticated and unauthenticated attackers.

Q: How urgent is CVE-2021-42558?

Priority 42/100. Public exploit reference

This month

MEDIUM 6.1UPGRADE

CVE-2021-42558 is a medium-severity flaw (CVSS 6.1) affecting caldera. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in CALDERA 2.8.1. It contains multiple reflected, stored, and self XSS vulnerabilities that may be exploited by authenticated and unauthenticated attackers.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.1% (top 36%)
CISA exploited list	No
Weakness	CWE-79
Published	2022-01-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mitre

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

Am I affected?

Timeline

2022-01-12 20:15 UTCPublished CVE record published
2026-06-17 04:09 UTCUpdated Record last modified

mitre caldera UPGRADE

Affected: <= 2.8.1

Fixed in: newer than 2.8.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.8.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade caldera

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-2021-42558?

caldera: upgrade to newer than 2.8.1. Exact commands for each OS are on this page.

Is CVE-2021-42558 being exploited?

CVE-2021-42558 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-2021-42558 affect?

CVE-2021-42558 affects caldera. Severity is medium (CVSS 6.1). An issue was discovered in CALDERA 2.8.1. It contains multiple reflected, stored, and self XSS vulnerabilities that may be exploited by authenticated and unauthenticated attackers.

How urgent is CVE-2021-42558?

Priority 42/100. Public exploit reference

Related CVEs

CVE-2022-41139 MEDIUM 5.4 UPGRADE MITRE CALDERA 4.1.0 allows stored XSS via app.contact.gist (aka the gist contact configuration field), leading
CVE-2022-40606 MEDIUM 6.1 UPGRADE MITRE CALDERA before 4.1.0 allows XSS in the Operations tab and/or Debrief plugin via a crafted operation name
CVE-2022-40605 MEDIUM 6.1 UPGRADE MITRE CALDERA before 4.1.0 allows XSS in the Operations tab and/or Debrief plugin via a crafted operation name
CVE-2021-42562 HIGH 8.1 UPGRADE An issue was discovered in CALDERA 2.8.1
CVE-2021-42561 HIGH 8.8 UPGRADE An issue was discovered in CALDERA 2.8.1

References

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