CVE-2025-48057: Icinga 2 is a monitoring system which checks the availability of network resources, notifies users of outages,

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2025-48057 is a critical-severity flaw (CVSS 9.8) affecting icinga. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Icinga 2 is a monitoring system which checks the availability of network resources, notifies users of outages, and generates performance data for reporting. Prior to versions 2.12.12, 2.13.12, and 2.14.6, the VerifyCertificate() function can be tricked into incorrectly treating certificates as valid. This allows an attacker to send a malicious certificate request that is then treated as a renewal of an already existing certificate, resulting in t

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 60%)
CISA exploited list	No
Weakness	CWE-296
Published	2025-05-27
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: icinga

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

Am I affected?

Timeline

2025-05-27 17:15 UTCPublished CVE record published
2026-06-17 09:29 UTCUpdated Record last modified

icinga icinga UPGRADE

Affected: < 2.12.12 · >= 2.13.0 and < 2.13.12 · >= 2.14.0 and < 2.14.6

Fixed in: 2.12.12, 2.13.12, 2.14.6

Safe to downgrade to: a release before 2.13.0

1. Check installed version

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

2. UPGRADE to 2.12.12 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade icinga

Note

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

3. If no update is available yet, DOWNGRADE to a release before 2.13.0 (Debian / Ubuntu)

apt-cache madison icinga sudo apt install icinga=<VERSION_BEFORE_2.13.0> sudo apt-mark hold icinga

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list icinga sudo dnf downgrade icinga-<VERSION_BEFORE_2.13.0> sudo dnf versionlock add icinga

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-2025-48057?

icinga: upgrade to 2.12.12, 2.13.12, 2.14.6. Exact commands for each OS are on this page.

Is CVE-2025-48057 being exploited?

CVE-2025-48057 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-2025-48057 affect?

CVE-2025-48057 affects icinga. Severity is critical (CVSS 9.8). Icinga 2 is a monitoring system which checks the availability of network resources, notifies users of outages, and generates performance data for reporting. Prior to versions 2.12.12, 2.13.12, and 2.14.6, the VerifyCertificate() function ca

How urgent is CVE-2025-48057?

Priority 49/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-61908 MEDIUM 6.5 UPGRADE Icinga 2 is an open source monitoring system
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CVE-2026-24413 MEDIUM 5.5 UPGRADE Icinga 2 is an open source monitoring system
CVE-2024-49369 CRITICAL 9.8 UPGRADE MITIGATE Icinga is a monitoring system which checks the availability of network resources, notifies users of outages, a

References

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