Icinga 2 Denial of Service (DoS) By Dereferencing Invalid Reference
Icinga 2 is an open source monitoring system. From 2.10.0 to before 2.15.1, 2.14.7, and 2.13.13, when creating an invalid reference, such as a reference to null, dereferencing results in a segmentation fault. This can be used by any API user with access to an API endpoint that allows specifying a filter expression to crash the Icinga 2 daemon. A fix is included in the following Icinga 2 versions: 2.15.1, 2.14.7, and 2.13.13.
- Published
- Oct 16, 2025
- Updated
- Jun 17, 2026
- EPSS
- 0.5% · 43th percentile
- CWE
- CWE-476
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Report tools
Action score
28
Monitor
Low priority for now.
- CVSS
- 28 / 40 · 7.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.5%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · GitHub_M
- 7.1
- NVD has not scored this yet; the score shown is the CNA’s.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| icinga | icinga | cpe:2.3:a:icinga:icinga |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- icinga icinga2.10.0 and later · before 2.13.13
- icinga icinga2.14.0 and later · before 2.14.7
- icinga icinga2.15.0 and later · before 2.15.1
Versions reported by the vendor
Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.
Icinga icinga2
- >=2.10.0, < 2.13.13, >=2.14.0, < 2.14.7, >=2.15.0, < 2.15.1affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | icinga2 | all versions | — |
| Debian:13 | icinga2 | before 2.14.6-1+deb13u1 | 2.14.6-1+deb13u1 |
| Debian:14 | icinga2 | before 2.15.1-1 | 2.15.1-1 |
| openSUSE:Tumbleweed | icinga2 | before 2.15.1-1.1 | 2.15.1-1.1 |
Same product
icinga: all recordsOther highest-scoring records for the same primary product.
- CVE-2024-49369Icinga 2 has a TLS Certificate Validation Bypass for JSON-RPC and HTTP API Connections40Plan
- CVE-2025-48057Icinga 2 certificate renewal might incorrectly renew an invalid certificate37Monitor
- CVE-2021-32743Passwords used to access external services inadvertently exposed through API36Monitor
- CVE-2020-29663Icinga 2 v2.8.0 through v2.11.7 and v2.12.2 has an issue where revoked certificates due for renewal will automatically be renewed, ignoring 36Monitor
- CVE-2021-32739Results of queries for ApiListener objects include the ticket salt which allows in turn to steal (more privileged) identities35Monitor
- CVE-2024-24820Icinga Director configuration is susceptible to Cross-Site Request Forgery33Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:icinga2 | 2.14.6-1+deb13u1 · Debian:13 | Package registry (OSV) |
| opensuse:icinga2 | 2.15.1-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- Integrity
- Availability
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- X
Weakness class (CWE)
CWE-476 · NULL Pointer DereferenceCVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- github.com/Icinga/icinga2/pull/6521
- github.com/Icinga/icinga2/security/advisories/GHSA-v9jg-xqhj-f43g
- icinga.com/blog/releasing-icinga-2-v2-15-1-2-14-7-and-2-13-13-and-icinga-db-web-v1-2-3-and-1-1-4
Vendor advisories and official records. Exploit/PoC links are deliberately left out.