CVE-2024-49369: Icinga is a monitoring system which checks the availability of network resources, notifies users of outages, a

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CRITICAL 9.8REMOTEWATCHLISTUPGRADEMITIGATE

CVE-2024-49369 is a critical-severity flaw (CVSS 9.8) affecting icinga, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Icinga is a monitoring system which checks the availability of network resources, notifies users of outages, and generates performance data for reporting. The TLS certificate validation in all Icinga 2 versions starting from 2.4.0 was flawed, allowing an attacker to impersonate both trusted cluster nodes as well as any API users that use TLS client certificates for authentication (ApiUser objects with the client_cn attribute set). This vulnerabil

Why this priority

Critical severity
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action
On your watchlist

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	2.9% (top 13%)
CISA exploited list	No
Weakness	CWE-295
Published	2024-11-12
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2024-11-12 17:15 UTCPublished CVE record published
2026-06-17 07:59 UTCUpdated Record last modified

icinga icinga UPGRADE

Affected: >= 2.4.0 and < 2.11.12 · >= 2.12.0 and < 2.12.11 · >= 2.13.0 and < 2.13.10 · >= 2.14.0 and < 2.14.3

Fixed in: 2.11.12, 2.12.11, 2.13.10, 2.14.3

Safe to downgrade to: a release before 2.4.0

1. Check installed version

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

2. UPGRADE to 2.11.12 (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 2.4.0 (Debian / Ubuntu)

apt-cache madison icinga sudo apt install icinga=<VERSION_BEFORE_2.4.0> 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_2.4.0> 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.

debian debian linux MITIGATE

Affected: 11.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · byobu · FIXED · 7.23-1.fc46 · FEDORA-2026-08f2b53446 · source

sudo dnf upgrade --advisory=FEDORA-2026-08f2b53446

Ubuntu 25.04 · icinga2 · NOT AFFECTED

Ubuntu 25.10 · icinga2 · NOT AFFECTED

Debian 12 · icinga2 · FIXED · 2.13.6-2+deb12u2

sudo apt update && sudo apt install --only-upgrade icinga2 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' icinga2)" ge "2.13.6-2+deb12u2" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · icinga2 · FIXED · 2.14.3-1

sudo apt update && sudo apt install --only-upgrade icinga2 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' icinga2)" ge "2.14.3-1" && echo PATCHED || echo STILL-VULNERABLE

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: Quantum-Sicarius/CVE-2024-49369 (2 stars)

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-2024-49369?

icinga: upgrade to 2.11.12, 2.12.11, 2.13.10, 2.14.3; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-49369 being exploited?

CVE-2024-49369 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-2024-49369 affect?

CVE-2024-49369 affects icinga, debian linux. Severity is critical (CVSS 9.8). Icinga is a monitoring system which checks the availability of network resources, notifies users of outages, and generates performance data for reporting. The TLS certificate validation in all Icinga 2 versions starting from 2.4.0 was flawe

How urgent is CVE-2024-49369?

Priority 69/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

CVE-2025-61908 MEDIUM 6.5 UPGRADE Icinga 2 is an open source monitoring system
CVE-2025-61907 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-2025-48057 CRITICAL 9.8 UPGRADE Icinga 2 is a monitoring system which checks the availability of network resources, notifies users of outages,

References

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