Security readout for executives and security teams
Plain-English summary
A flaw in certain Zyxel firewall firmware lets an unauthenticated network attacker use a crafted web-management URL to access files outside intended directories. The supplied record says files may be downloaded or uploaded. Because CISA lists this CVE as known exploited, affected appliances should be treated as urgent exposure, especially when management interfaces are internet-accessible.
Executive priority
Treat as an immediate remediation priority because exploitation is documented through CISA KEV and no authentication is required. Prioritize internet-reachable management interfaces, restrict access at once, and complete vendor-guided firmware remediation. Investigate potentially exposed devices rather than assuming an upgrade alone resolves prior compromise.
Technical view
CVE-2024-11667 is a CWE-22 directory traversal issue affecting the web management interface. Listed ranges are ATP and USG FLEX V5.00–V5.38, plus USG FLEX 50(W) and USG20(W)-VPN V5.10–V5.38. CVSS 3.1 is 7.5: network-accessible, low complexity, unauthenticated, no user interaction, with high confidentiality impact.
Likely exposure
Exposure is most likely where an affected Zyxel appliance runs a listed firmware version and its web management interface is reachable by untrusted networks. The bundle does not identify specific models, configurations, ports, or exposure prerequisites beyond the management interface, so organizations must verify their own inventory and interface accessibility.
Exploitation context
CISA KEV inclusion supports active exploitation in the wild. The supplied sources do not describe campaign scope, attacker attribution, exploitation frequency, indicators, or resulting actions. Do not interpret KEV inclusion as proof that every exposed device has been compromised.
Researcher notes
The source bundle contains an inconsistency: its description says attackers may download or upload files, while the supplied CVSS vector records high confidentiality impact but no integrity impact. Researchers should preserve that uncertainty and rely on Zyxel's advisory for authoritative affected-model, fixed-version, and impact details. No exploit mechanics or indicators are provided.
Mitigation direction
- Identify appliances running firmware within the affected version ranges.
- Restrict web management access to trusted administrative networks immediately.
- Consult Zyxel's advisory and apply the vendor-specified fixed firmware or mitigation.
- Review exposed appliances for unauthorized file access or changes.
- Escalate suspected compromise through the organization's incident-response process.
Validation and detection
- Record each appliance model, firmware version, and management-interface exposure.
- Confirm untrusted networks cannot reach the web management interface.
- Verify installed firmware against Zyxel's current advisory guidance.
- Review management and security logs for anomalous file-related requests.
- Check appliance files and configuration for unexplained changes.
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-22: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. 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-2024-11667 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
- 7.5 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A: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.
CISA KEV status
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N3.93.6ZyxelVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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.
- Added to KEVCISA-ADP
CISA Known Exploited Vulnerabilities metadata lists this CVE as known exploited.
- ADP timelineCISA-ADP
CVE-2024-11667 added to CISA KEV
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2024-12-03T00:00:00.000Z: CVE-2024-11667 added to CISA KEV
Source materials
- CVE List V5 sourceCVE List V5
- https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-protecting-against-recent-firewall-threats-11-27-2024CVE reference, Zyxel · vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-11667CVE reference, CISA-ADP · government-resource
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.