CVE-2025-64996 | Overly broad file permissions in the mk_inotify plugin allows reading and manipulating the plugin's output

In Checkmk versions prior to 2.4.0p16, 2.3.0p41, and all versions of 2.2.0 and older, the mk_inotify plugin creates world-readable and writable files, allowing any local user on the system to read the plugin's output and manipulate it, potentially leading to unauthorized access to or modification of monitoring data.

Published: 2025-11-18 Last update: 2025-11-24 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-64996 is rated Low Risk (19.8/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.02%). Low composite risk—no urgent action required; patch on your normal maintenance cycle and revisit priority if CVSS or EPSS increases.

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-2025-64996

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 2025-11-19 — 0.02% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-64996

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.8 4.0 MEDIUM
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/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 Click to expand
Attack vector (AV:L)
Attacker needs local access on the target system.
Attack complexity (AC:L)
Exploitation conditions are straightforward and stable.
Attack requirements (AT:N)
No additional preconditions are required beyond normal reachability.
Privileges required (PR:L)
Low privileges are required.
User interaction (UI:N)
No user interaction is required.
Vulnerable system confidentiality impact (VC:N)
No confidentiality impact on the vulnerable system.
Vulnerable system integrity impact (VI:L)
Limited integrity impact on the vulnerable system.
Vulnerable system availability impact (VA:N)
No availability impact on the vulnerable system.
Subsequent system confidentiality impact (SC:L)
Limited confidentiality impact on subsequent systems.
Subsequent system integrity impact (SI:N)
No integrity impact on subsequent systems.
Subsequent system availability impact (SA:N)
No availability impact on subsequent systems.
Exploit maturity (threat) (E:X)
Not defined: no reliable threat intelligence; scoring assumes the worst case (equivalent to Attacked).
Confidentiality requirement (CR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Integrity requirement (IR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Availability requirement (AR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Modified attack vector (MAV:X)
Not defined: scoring uses the Base Attack Vector (AV).
Modified attack complexity (MAC:X)
Not defined: scoring uses the Base Attack Complexity (AC).
Modified attack requirements (MAT:X)
Not defined: scoring uses the Base Attack Requirements (AT).
Modified privileges required (MPR:X)
Not defined: scoring uses the Base Privileges Required (PR).
Modified user interaction (MUI:X)
Not defined: scoring uses the Base User Interaction (UI).
Modified vulnerable system confidentiality impact (MVC:X)
Not defined: scoring uses the Base VC metric.
Modified vulnerable system integrity impact (MVI:X)
Not defined: scoring uses the Base VI metric.
Modified vulnerable system availability impact (MVA:X)
Not defined: scoring uses the Base VA metric.
Modified subsequent system confidentiality impact (MSC:X)
Not defined: scoring uses the Base SC metric.
Modified subsequent system integrity impact (MSI:X)
Not defined: scoring uses the Base SI metric.
Modified subsequent system availability impact (MSA:X)
Not defined: scoring uses the Base SA metric.
Safety (supplemental) (S:X)
Not evaluated.
Automatable (supplemental) (AU:X)
Not evaluated.
Recovery (supplemental) (R:X)
Not evaluated.
Value density (supplemental) (V:X)
Not evaluated.
Vulnerability response effort (supplemental) (RE:X)
Not evaluated.
Provider urgency (supplemental) (U:X)
Not evaluated.
 — — [email protected]
4.4 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 1.8 2.5 [email protected]

Weakness enumeration for CVE-2025-64996

OS Trackers for CVE-2025-64996

vendor priority summary link
ubuntu medium CVE-2025-64996 medium priority: Ubuntu including 1 source packages (check-mk), 7 status rows across 7 suites (bionic, jammy, noble, plucky, questing, upstream, xenial): DNE 4, needs-triage 3. https://ubuntu.com/security/CVE-2025-64996

Affected software / configurations for CVE-2025-64996

Vendor Product Version Raw CPE
checkmk checkmk < 2.3.0 cpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:-:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:b1:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:b2:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:b3:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:b4:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:b5:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:b6:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p1:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p10:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p11:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p12:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p13:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p14:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p15:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p16:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p17:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p18:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p19:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p2:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p20:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p21:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p22:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p23:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p24:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p25:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p26:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p27:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p28:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p29:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p3:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p30:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p31:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p32:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p33:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p34:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p35:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p36:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p37:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p38:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p39:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p4:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p40:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p5:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p6:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p7:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p8:*:*:*:*:*:*
checkmk checkmk 2.3.0 cpe:2.3:a:checkmk:checkmk:2.3.0:p9:*:*:*:*:*:*
checkmk checkmk 2.4.0 cpe:2.3:a:checkmk:checkmk:2.4.0:-:*:*:*:*:*:*
checkmk checkmk 2.4.0 cpe:2.3:a:checkmk:checkmk:2.4.0:b1:*:*:*:*:*:*
checkmk checkmk 2.4.0 cpe:2.3:a:checkmk:checkmk:2.4.0:b2:*:*:*:*:*:*
checkmk checkmk 2.4.0 cpe:2.3:a:checkmk:checkmk:2.4.0:b3:*:*:*:*:*:*
checkmk checkmk 2.4.0 cpe:2.3:a:checkmk:checkmk:2.4.0:b4:*:*:*:*:*:*
checkmk checkmk 2.4.0 cpe:2.3:a:checkmk:checkmk:2.4.0:b5:*:*:*:*:*:*
checkmk checkmk 2.4.0 cpe:2.3:a:checkmk:checkmk:2.4.0:b6:*:*:*:*:*:*
checkmk checkmk 2.4.0 cpe:2.3:a:checkmk:checkmk:2.4.0:p1:*:*:*:*:*:*
checkmk checkmk 2.4.0 cpe:2.3:a:checkmk:checkmk:2.4.0:p10:*:*:*:*:*:*
checkmk checkmk 2.4.0 cpe:2.3:a:checkmk:checkmk:2.4.0:p11:*:*:*:*:*:*
checkmk checkmk 2.4.0 cpe:2.3:a:checkmk:checkmk:2.4.0:p12:*:*:*:*:*:*
checkmk checkmk 2.4.0 cpe:2.3:a:checkmk:checkmk:2.4.0:p13:*:*:*:*:*:*
checkmk checkmk 2.4.0 cpe:2.3:a:checkmk:checkmk:2.4.0:p14:*:*:*:*:*:*
checkmk checkmk 2.4.0 cpe:2.3:a:checkmk:checkmk:2.4.0:p15:*:*:*:*:*:*
checkmk checkmk 2.4.0 cpe:2.3:a:checkmk:checkmk:2.4.0:p2:*:*:*:*:*:*
checkmk checkmk 2.4.0 cpe:2.3:a:checkmk:checkmk:2.4.0:p3:*:*:*:*:*:*
checkmk checkmk 2.4.0 cpe:2.3:a:checkmk:checkmk:2.4.0:p4:*:*:*:*:*:*
checkmk checkmk 2.4.0 cpe:2.3:a:checkmk:checkmk:2.4.0:p5:*:*:*:*:*:*
checkmk checkmk 2.4.0 cpe:2.3:a:checkmk:checkmk:2.4.0:p6:*:*:*:*:*:*
checkmk checkmk 2.4.0 cpe:2.3:a:checkmk:checkmk:2.4.0:p7:*:*:*:*:*:*
checkmk checkmk 2.4.0 cpe:2.3:a:checkmk:checkmk:2.4.0:p8:*:*:*:*:*:*
checkmk checkmk 2.4.0 cpe:2.3:a:checkmk:checkmk:2.4.0:p9:*:*:*:*:*:*

References for CVE-2025-64996

URL Tags
https://checkmk.com/werk/18570 Mitigation Vendor Advisory
cvelogic Threat Intelligence