Security readout for executives and security teams
Plain-English summary
CVE-2025-52936 is a critical link-following file access flaw in yrutschle sslh before 2.2.2. A local, low-privileged attacker could potentially make sslh access unintended files through improper link resolution. The CVE rates impact as high for confidentiality and integrity, with some availability impact. No provided source confirms active exploitation.
Executive priority
Treat this as high priority for servers running sslh with local user access or shared administration. It is critical by score, but not currently evidenced as remotely exploitable or actively exploited in the provided sources.
Technical view
The issue is CWE-59, Improper Link Resolution Before File Access. The CVE lists sslh versions before 2.2.2 as affected and assigns CVSS 4.0 score 9.3. Attack vector is local, privileges required are low, user interaction is not required. The upstream GitHub pull request is tagged as a patch reference.
Likely exposure
Exposure is most relevant where sslh before 2.2.2 is installed, especially on multi-user systems or hosts where untrusted users can influence local filesystem paths. Debian LTS announcements are referenced, so Debian-packaged deployments should be checked against vendor advisories.
Exploitation context
The CVSS vector indicates local access and low privileges are required, not remote unauthenticated access. No KEV listing or provided source states active exploitation. Public details in the bundle do not describe a complete exploitation method, so operational exploitability should be validated from vendor advisories.
Researcher notes
Evidence is limited to the CVE record, an upstream patch pull request, and Debian LTS references. The affected range is stated as before 2.2.2. The CVSS vector is local with low privileges. Avoid assuming remote exploitation or broader product impact without additional vendor detail.
Mitigation direction
- Upgrade sslh to version 2.2.2 or later where available.
- Apply relevant Debian LTS security updates if using Debian packages.
- Review the upstream patch reference for affected code paths.
- If updates are unavailable, check vendor guidance for supported temporary mitigations.
Validation and detection
- Inventory systems running sslh and record installed versions.
- Flag any sslh version earlier than 2.2.2 for remediation.
- Check Debian package changelogs or advisories for CVE-2025-52936 fixes.
- Confirm patched packages or upstream version are deployed after maintenance.
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-59: 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-2025-52936 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
- Critical
- CVSS
- 9.3 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/S:N/AU:Y/R:U/V:C/RE:M/U:Amber
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.
SSVC decision data
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:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/S:N/AU:Y/R:U/V:C/RE:M/U:Amber——GovTech CSGVulnerability scoring details
Base CVSS 4.0 score
9.3CriticalVector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/S:N/AU:Y/R:U/V:C/RE:M/U:Amber
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/yrutschle/sslh/pull/494CVE reference, GovTech CSG · patch
- https://lists.debian.org/debian-lts-announce/2025/07/msg00001.htmlCVE reference, CVE
- https://lists.debian.org/debian-lts-announce/2026/08/msg00004.htmlCVE reference, CVE
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.
Improper Link Resolution Before File Access ('Link Following')
Improper Link Resolution Before File Access ('Link Following') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.