Security readout for executives and security teams
Plain-English summary
AVAST Antivirus 25.11 reportedly installs its SecureLine service with an unsafe Windows service path. A local low-privileged user could abuse that configuration to run code as SYSTEM. This is not a remote internet attack, but it can turn endpoint access into full local control.
Executive priority
Treat this as high priority for endpoint hardening. It requires local access, but successful abuse gives SYSTEM privileges, which can defeat containment after an attacker or insider reaches a workstation.
Technical view
The issue is CWE-428: an unquoted service executable path in Avast SecureLine on AVAST Antivirus 25.11. The CVSS 4.0 score is 8.5, with local access, low complexity, low privileges, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure appears limited to Windows endpoints running AVAST Antivirus 25.11 with the affected SecureLine service configuration. Organizations without this version or service are not shown as affected by the supplied sources.
Exploitation context
The CVE bundle cites an ExploitDB entry, so public exploit information exists. KEV is false, and the supplied sources do not establish active exploitation in the wild.
Researcher notes
Evidence is adequate for affected version, weakness class, and impact, but patch status is not specified in the supplied bundle. Avoid assuming broader Avast products or versions are affected without vendor confirmation.
Mitigation direction
- Check Avast vendor guidance for fixed builds or official mitigation.
- Prioritize upgrading or remediating AVAST Antivirus 25.11 endpoints.
- Disable or remove SecureLine only if vendor guidance and business requirements allow it.
- Limit local interactive access on affected endpoints until remediated.
- Monitor endpoint alerts for suspicious service-related privilege escalation activity.
Validation and detection
- Inventory endpoints for AVAST Antivirus 25.11.
- Confirm whether the SecureLine service is installed and enabled.
- Review the SecureLine service path for unquoted executable configuration.
- Assess whether standard users can modify relevant service path locations.
- Record remediation status and installed Avast build after vendor-directed updates.
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-428: 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 lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2025-71326 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
- High
- CVSS
- 8.5 (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:H/SC:N/SI:N/SA:N
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
2 official scoresWe 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:H/SC:N/SI:N/SA:N——VulnCheckCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9VulnCheckVulnerability scoring details
Base CVSS 4.0 score
8.5HighVector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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
- ExploitDB-52510CVE reference, VulnCheck · exploit
- Official Product HomepageCVE reference, VulnCheck · product
- VulnCheck Advisory: AVAST Antivirus 25.11 Unquoted Service Path Privilege EscalationCVE reference, VulnCheck · third-party-advisory
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.
Unquoted Search Path or Element
Unquoted Search Path or Element represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.