CVE-2021-37698: Icinga is a monitoring system which checks the availability of network resources, notifies users of outages, and generates performance data for reporting. In…

PriorityP344high7.5CVSS 3.1

AVNACLPRNUINSUCHINAN

EPSS

1.42%

69.5th percentile

Icinga is a monitoring system which checks the availability of network resources, notifies users of outages, and generates performance data for reporting. In versions 2.5.0 through 2.13.0, ElasticsearchWriter, GelfWriter, InfluxdbWriter and Influxdb2Writer do not verify the server's certificate despite a certificate authority being specified. Icinga 2 instances which connect to any of the mentioned time series databases (TSDBs) using TLS over a spoofable infrastructure should immediately upgrade to version 2.13.1, 2.12.6, or 2.11.11 to patch the issue. Such instances should also change the credentials (if any) used by the TSDB writer feature to authenticate against the TSDB. There are no workarounds aside from upgrading.

Affected

10 ranges

Vendor	Product	Version range	Fixed in
debian	debian_linux	—	—
debian	icinga2	< icinga2 2.13.1-1 (bookworm)	icinga2 2.13.1-1 (bookworm)
icinga	icinga	>= 2.12.0 < 2.12.6	2.12.6
icinga	icinga	>= 2.13.0 < 2.13.1	2.13.1
icinga	icinga	>= 2.5.0 < 2.11.10	2.11.10
icinga	icinga2	—	—
icinga	icinga2	>= 0 < 2.12.3-1+deb11u1	2.12.3-1+deb11u1
icinga	icinga2	>= 0 < 2.13.1-1	2.13.1-1
icinga	icinga2	>= 0 < 2.13.1-1	2.13.1-1
icinga	icinga2	>= 0 < 2.13.1-1	2.13.1-1

CVSS provenance

nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

nvdv2.05.0MEDIUMAV:N/AC:L/Au:N/C:P/I:N/A:N

osv7.5HIGH

vendor_debian7.5HIGH

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.