Security readout for executives and security teams
Plain-English summary
CVE-2018-3949 is a high-severity information disclosure flaw in the TP-Link TL-R600VPN HTTP server. A network attacker can make a crafted web request that abuses directory traversal to read sensitive system files. The strongest business risk is exposure of device secrets or configuration data from vulnerable VPN routers.
Executive priority
Treat this as a near-term infrastructure hygiene item, especially for internet-exposed VPN routers. It is not KEV-listed in the supplied data, but unauthenticated network file disclosure on perimeter equipment can create meaningful follow-on risk.
Technical view
The vulnerability affects TP-Link TL-R600VPN HWv3 FRNv1.3.0 and HWv2 FRNv1.2.3. The CVSS 3.0 score is 7.5, with network attack vector, low complexity, no required privileges, no user interaction, and high confidentiality impact. Integrity and availability impact are not described.
Likely exposure
Organizations are most exposed if affected TL-R600VPN devices have their HTTP management service reachable from untrusted networks, including the internet, partner networks, or broad internal segments.
Exploitation context
The source bundle says either unauthenticated or authenticated web requests can trigger the issue. It does not cite CISA KEV listing or confirmed exploitation in the wild, so active exploitation should not be assumed from these sources alone.
Researcher notes
Evidence is limited to the CVE description and Talos reference in the supplied bundle. No CWE, patch version, or exploitation-in-the-wild evidence is provided. Focus validation on exact hardware and firmware matching, management-plane reachability, and whether vendor remediation exists.
Mitigation direction
- Inventory TP-Link TL-R600VPN devices and confirm hardware and firmware versions.
- Check TP-Link and Talos guidance for fixed firmware or vendor-approved remediation.
- Remove internet exposure for the device HTTP management interface.
- Restrict management access to trusted administrative networks only.
- Review router configurations for sensitive data exposure risk.
Validation and detection
- Identify devices running TL-R600VPN HWv3 FRNv1.3.0 or HWv2 FRNv1.2.3.
- Confirm whether HTTP management is reachable from untrusted networks.
- Review web management logs for unexpected requests to sensitive file paths.
- Verify whether vendor guidance lists an update or replacement path.
- Document compensating controls if patched firmware is unavailable.
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.
File 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-2018-3949 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 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/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.
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:N/A:N3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.5HighVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://talosintelligence.com/vulnerability_reports/TALOS-2018-0618CVE reference · x_refsource_MISC
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.