CVE-2021-40906
Summary
| CVE | CVE-2021-40906 |
|---|---|
| State | PUBLISHED |
| Assigner | mitre |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2022-03-25 23:15:08 UTC |
| Updated | 2026-07-09 01:17:02 UTC |
| Description | CheckMK Raw Edition software (versions 1.5.0 to 1.6.0) does not sanitise the input of a web service parameter that is in an unauthenticated zone. This Reflected XSS allows an attacker to open a backdoor on the device with HTML content and interpreted by the browser (such as JavaScript or other client-side scripts) or to steal the session cookies of a user who has previously authenticated via a man in the middle. Successful exploitation requires access to the web service resource without authentication. |
Risk And Classification
Primary CVSS: v3.1 6.1 MEDIUM from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS: 0.009740000 probability, percentile 0.579210000 (date 2026-07-12)
Problem Types: CWE-79 | n/a
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 6.1 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| 2.0 | [email protected] | Primary | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
RequiredScope
ChangedConfidentiality
LowIntegrity
LowAvailability
NoneCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS v2.0 Breakdown
Access Vector
NetworkAccess Complexity
MediumAuthentication
NoneConfidentiality
NoneIntegrity
PartialAvailability
NoneAV:N/AC:M/Au:N/C:N/I:P/A:N
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Checkmk | Checkmk | All | All | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | - | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | b1 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | b10 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | b12 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | b3 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | b4 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | b5 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | b9 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | p1 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | p10 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | p11 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | p12 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | p13 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | p14 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | p15 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | p16 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | p19 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | p2 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | p20 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | p21 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | p22 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | p23 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | p24 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | p25 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | p3 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | p4 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | p5 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | p6 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | p7 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | p8 | All | All |
| Application | Checkmk | Checkmk | 1.6.0 | p9 | All | All |
| Application | Tribe29 | Checkmk | 1.6.0b10 | All | All | All |
| Application | Tribe29 | Checkmk | 1.6.0b11 | All | All | All |
| Application | Tribe29 | Checkmk | 1.6.0p10 | All | All | All |
| Application | Tribe29 | Checkmk | 1.6.0p17 | All | All | All |
| Application | Tribe29 | Checkmk | 1.6.0p18 | All | All | All |
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| GitHub - Edgarloyola/CVE-2021-40906 | af854a3a-2127-422b-91ae-364da2661108 | github.com | Third Party Advisory |
| Infrastructure & Application Monitoring with Checkmk | MITRE | checkmk.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Legacy QID Mappings
- 198866 Ubuntu Security Notification for Checkmk Vulnerabilities (USN-5527-1)