CVE-2021-27676: Centreon version 20.10.2 is affected by a cross-site scripting (XSS) vulnerability

Routine

MEDIUM 5.4DOWNGRADE

CVE-2021-27676 is a medium-severity flaw (CVSS 5.4) affecting centreon. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Centreon version 20.10.2 is affected by a cross-site scripting (XSS) vulnerability. The dep_description (Dependency Description) and dep_name (Dependency Name) parameters are vulnerable to stored XSS. A user has to log in and go to the Configuration > Notifications > Hosts page.

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 50%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-05-26
Last modified	2026-07-09

Publisher (CNA): MITRE · Vendor: centreon

Last updated 2026-07-09 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-05-26 11:15 UTCPublished CVE record published
2026-07-09 01:16 UTCUpdated Record last modified

centreon centreon DOWNGRADE

Affected: 20.10.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 20.10.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 20.10.2 (Debian / Ubuntu)

apt-cache madison centreon sudo apt install centreon=<VERSION_BEFORE_20.10.2> sudo apt-mark hold centreon

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

dnf --showduplicates list centreon sudo dnf downgrade centreon-<VERSION_BEFORE_20.10.2> sudo dnf versionlock add centreon

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-2021-27676?

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

Is CVE-2021-27676 being exploited?

CVE-2021-27676 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-2021-27676 affect?

CVE-2021-27676 affects centreon. Severity is medium (CVSS 5.4). Centreon version 20.10.2 is affected by a cross-site scripting (XSS) vulnerability. The dep_description (Dependency Description) and dep_name (Dependency Name) parameters are vulnerable to stored XSS. A user has to log in and go to the Conf

How urgent is CVE-2021-27676?

Priority 31/100. No elevated risk signals yet.

Related CVEs

CVE-2024-39843 MEDIUM 6.7 DOWNGRADE A SQL injection vulnerability in Centreon 24.04.2 allows a remote high-privileged attacker to execute arbitrar
CVE-2024-39842 HIGH 7.2 DOWNGRADE A SQL injection vulnerability in Centreon 24.04.2 allows a remote high-privileged attacker to execute arbitrar
CVE-2022-42429 HIGH 8.8 UPGRADE This vulnerability allows remote attackers to escalate privileges on affected installations of Centreon
CVE-2022-42428 HIGH 8.8 UPGRADE This vulnerability allows remote attackers to escalate privileges on affected installations of Centreon
CVE-2022-42427 HIGH 8.8 UPGRADE This vulnerability allows remote attackers to escalate privileges on affected installations of Centreon

References

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