CVE-2025-48057

CRITICAL

9.8

CVSS v3

Description

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 the attacker obtaining a valid certificate that can be used to impersonate trusted nodes. This only occurs when Icinga 2 is built with OpenSSL older than version 1.1.0. This issue has been patched in versions 2.12.12, 2.13.12, and 2.14.6.

CWE-296

How to fix

Remediation Available

icinga2Debian

Fixed in:2.14.6-1CVE-2025-48057

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.44%probability of exploitation in 30 days

38thpercentile

Low risk: more likely to be exploited than 38% of all known CVEs.

References

Patch6

Related Vulnerabilities

Other CWE-296 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-44532	Medium	5.3	10%	-	Fix
CVE-2019-3890	High	8.1	1.0%	-	Fix
CVE-2021-1566	High	7.4	0.7%	-	Fix
CVE-2019-3762	High	7.5	0.6%	-	-
CVE-2021-23155	Critical	9.0	0.5%	-	Fix
CVE-2026-44852	High	7.2	0.4%	-	Fix

Common questions

How do I fix CVE-2025-48057?

Upgrade icinga2 on debian 13 to 2.14.6-1 or later.

Is CVE-2025-48057 being actively exploited?

Not that we know of. CVE-2025-48057 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.44% is the estimated probability that it will be exploited in the next 30 days. That is higher than 38% of all scored CVEs.

How severe is CVE-2025-48057?

CVE-2025-48057 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2025-48057 affect?

Published advisories record a fix for icinga2 (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-17.