Security readout for executives and security teams
Plain-English summary
ClamAV 0.101.0 and 0.101.1 mishandle crafted nested RAR archives. A remote unauthenticated attacker could send a malicious archive to a system that scans it, with reported impact including denial of service and possible arbitrary file viewing or creation.
Executive priority
Treat this as urgent for any environment scanning untrusted archives with affected ClamAV versions. The CVSS score is critical and the reported impact crosses confidentiality, integrity, and availability, but active exploitation is not confirmed in the supplied sources.
Technical view
The issue affects ClamAV RAR scanning in versions 0.101.0 and 0.101.1. The source describes improper error handling for nested RAR files, mapped to CWE-20, with CVSS 3.0 score 9.8 and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely where affected ClamAV versions scan untrusted RAR files, such as file-upload, email, or gateway scanning workflows. The bundle does not identify specific appliances, deployments, or operating systems beyond Cisco ClamAV versions 0.101.0 and 0.101.1.
Exploitation context
The source says exploitation requires sending a crafted RAR file to an affected device and does not require authentication or user interaction. CISA KEV status is false in the bundle, so active exploitation is not established here.
Researcher notes
Evidence is limited to CVE metadata and referenced advisories. The description mixes denial of service language with arbitrary file viewing or creation impact; validate vendor advisory details before asserting exact exploit outcomes in asset-specific reporting.
Mitigation direction
- Inventory ClamAV deployments and identify versions 0.101.0 and 0.101.1.
- Follow ClamAV, Cisco, or distribution vendor guidance for updates or supported remediation.
- Reduce exposure to untrusted RAR archives until remediation is confirmed.
- Monitor affected scanning services for crashes or unusual file access behavior.
Validation and detection
- Confirm ClamAV version on every host or container running file scanning.
- Review scanner logs for nested RAR processing errors or service instability.
- Verify whether internet-facing workflows can submit archives to affected scanners.
- Check vendor advisories for the fixed version and confirm deployment.
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-20: 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 lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2019-1785 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
- 9.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
9.8CriticalVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://bugzilla.clamav.net/show_bug.cgi?id=12284CVE reference · x_refsource_MISC
- GLSA-201904-12CVE reference · vendor-advisory, x_refsource_GENTOO
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 Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.