Security readout for executives and security teams
Plain-English summary
NagVis versions through 1.9.33 have an authentication-cookie handling flaw. A remote attacker could potentially abuse type conversion around a hash value, but the published scoring says exploitation is high complexity and difficult. Business urgency is moderate: prioritize exposed NagVis deployments, especially internet-facing monitoring portals.
Executive priority
Handle in the normal vulnerability remediation cycle, with faster action for exposed monitoring portals. This is not presented as actively exploited, but monitoring systems can be sensitive operational assets.
Technical view
CVE-2022-3979 affects checkAuthCookie in share/server/core/classes/CoreLogonMultisite.php. Manipulating the hash argument can trigger incorrect type conversion, mapped to CWE-704. CVSS 3.1 is 5.6 with network access, high attack complexity, no privileges or user interaction, and low confidentiality, integrity, and availability impact.
Likely exposure
Organizations running NagVis 1.9.0 through 1.9.33 are in scope. Exposure is higher where NagVis is reachable from untrusted networks or embedded in monitoring environments with broad operational visibility.
Exploitation context
The bundle reports remote attackability but high complexity and difficult exploitation. CISA KEV status is false, and the provided sources do not establish active exploitation. Treat exploit status as unconfirmed unless newer vendor or threat-intelligence evidence appears.
Researcher notes
Focus validation on the multisite authentication path and PHP type handling around the hash argument. Do not assume broader Checkmk impact from related research unless a specific deployment includes affected NagVis code.
Mitigation direction
- Upgrade NagVis to 1.9.34 or later.
- Apply vendor or distribution backported fixes where direct upgrade is not possible.
- Restrict NagVis access to trusted networks or VPN users.
- Review vendor release notes and downstream OS advisories for package-specific guidance.
Validation and detection
- Inventory NagVis deployments and confirm installed versions.
- Check whether any instance is version 1.9.33 or earlier.
- Verify the 1.9.34 fix or commit 7574fd8a is present.
- Confirm internet-facing access is blocked or tightly controlled.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-704: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2022-3979 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L2.23.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.6MediumVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://vuldb.com/?id.213557CVE reference · vdb-entry, technical-description
- https://vuldb.com/?ctiid.213557CVE reference · signature, permissions-required
- https://github.com/NagVis/nagvis/commit/7574fd8a2903282c2e0d1feef5c4876763db21d5CVE reference · patch
- https://github.com/NagVis/nagvis/releases/tag/nagvis-1.9.34CVE reference · patch
- https://www.sonarsource.com/blog/checkmk-rce-chain-2/CVE reference · related
- https://lists.debian.org/debian-lts-announce/2025/05/msg00000.htmlCVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Incorrect Type Conversion or Cast
Incorrect Type Conversion or Cast represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.