CVE-2023-22359 | User-enumeration in RestAPI

User enumeration in Checkmk <=2.2.0p4 allows an authenticated attacker to enumerate usernames.

Published: 2023-06-26 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-22359 is rated Low Risk (37.4/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.35%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-22359

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-22 0.26% 0.35% +0.09%
2 2025-11-21 0.24% 0.26% +0.03%
3 2025-11-18 — 0.24% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-22359

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 1.4 [email protected]
4.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 1.4 [email protected]

Weakness enumeration for CVE-2023-22359

OS Trackers for CVE-2023-22359

vendor priority summary link
ubuntu medium CVE-2023-22359 medium priority: Ubuntu including 1 source packages (check-mk), 10 status rows across 10 suites (bionic, focal, jammy, mantic, noble, oracular, plucky, questing, upstream, xenial): DNE 7, needs-triage 3. https://ubuntu.com/security/CVE-2023-22359

Affected software / configurations for CVE-2023-22359

Vendor Product Version Raw CPE
checkmk checkmk 2.2.0 cpe:2.3:a:checkmk:checkmk:2.2.0:-:*:*:*:*:*:*
checkmk checkmk 2.2.0 cpe:2.3:a:checkmk:checkmk:2.2.0:b1:*:*:*:*:*:*
checkmk checkmk 2.2.0 cpe:2.3:a:checkmk:checkmk:2.2.0:b2:*:*:*:*:*:*
checkmk checkmk 2.2.0 cpe:2.3:a:checkmk:checkmk:2.2.0:b3:*:*:*:*:*:*
checkmk checkmk 2.2.0 cpe:2.3:a:checkmk:checkmk:2.2.0:b4:*:*:*:*:*:*
checkmk checkmk 2.2.0 cpe:2.3:a:checkmk:checkmk:2.2.0:b5:*:*:*:*:*:*
checkmk checkmk 2.2.0 cpe:2.3:a:checkmk:checkmk:2.2.0:b6:*:*:*:*:*:*
checkmk checkmk 2.2.0 cpe:2.3:a:checkmk:checkmk:2.2.0:b7:*:*:*:*:*:*
checkmk checkmk 2.2.0 cpe:2.3:a:checkmk:checkmk:2.2.0:b8:*:*:*:*:*:*
checkmk checkmk 2.2.0 cpe:2.3:a:checkmk:checkmk:2.2.0:i1:*:*:*:*:*:*
checkmk checkmk 2.2.0 cpe:2.3:a:checkmk:checkmk:2.2.0:p1:*:*:*:*:*:*
checkmk checkmk 2.2.0 cpe:2.3:a:checkmk:checkmk:2.2.0:p2:*:*:*:*:*:*
checkmk checkmk 2.2.0 cpe:2.3:a:checkmk:checkmk:2.2.0:p3:*:*:*:*:*:*
checkmk checkmk 2.2.0 cpe:2.3:a:checkmk:checkmk:2.2.0:p4:*:*:*:*:*:*

References for CVE-2023-22359

URL Tags
https://checkmk.com/werk/15890 Vendor Advisory
cvelogic Threat Intelligence