AvastSvc denial of service via unhandled JsonCpp exceptions in native message handlers
CVSS score
—
EPSS probability
%0.2
Risk score
—
Published
1 d ago
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Impact on My Inventory
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Vulnerability description
DayBreach AI Explanation
Verified against sourcesSources read
2
Source agreement
Tam uyum
Evidence confidence
%63
Short explanation
Unhandled exceptions in the AvastSvc native message dispatcher allow a local, unprivileged attacker to crash the service by sending specially crafted JSON messages.
This vulnerability can lead to denial of service conditions in affected products, allowing local users to disrupt or crash critical security services.
What should be done?
- Review vendor security advisories
- Apply the available product updates
Chain of evidence and sources
Yerel ve yetkisiz bir saldırgan, özel JSON mesajları göndererek AvastSvc servisini çökletebilir.
Temel neden, yerel mesaj işleme zincirindeki JSON türü dönüşümlerinde try-catch bloklarının bulunmamasıdır.
Show the technical text from the sources
Missing exception handlers in AvastSvc native message dispatcher (ashServ.dll) on Windows allow a local, unprivileged attacker to crash the service by sending specially crafted JSON messages. The vulnerability spans multiple handler pathways in the RPC-based native message protocol: * Log_NmSvc.message handler: converts JSON fields to strings without type validation and without exception boundaries. * OpenInSz_NmSvc handler: converts URL and origin fields to strings without type checking, exposing an exception. * OpenInSz_NmSvc.profile handler: converts the profile field to an integer without validation. In all three cases, the exceptions are not caught by action-specific handlers and propagate up the dispatcher. The common root cause is the absence of try-catch blocks around JSON type conversions in the native message processing chain.
CWE: CWE-248, CWE-391
This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-12067 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | Gen Digital | Avast Antivirus, Avast One, Avast Premium Security, Avast Ultimate, Avast Business Security | View |
| 2 | Gen Digital | AVG Antivirus Free, AVG Internet Security, AVG Ultimate | View |
| 3 | Gen Digital | Norton Antivirus Plus, Norton 360 Standard, Norton 360 Deluxe, Norton 360 Advanced | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| The sources have not yet published a verified CVSS metric. | ||||
Patch and Remediation Guide
Solution & Remediation Advisory
6 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.
Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-12067 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-12067 weaknesses.
Official Sources and Advisories
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Weakness Type (CWE & CAPEC)
Similar Vulnerabilities
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