Security readout for executives and security teams
Plain-English summary
This vulnerability can expose router and administrator passwords when a Tenda F3 configuration file is downloaded. The data is returned in plaintext and may also remain in local browser cache. The main business risk is credential disclosure leading to unauthorized router administration if an attacker already has low-privilege access or local cache access.
Executive priority
Treat as a high-priority router hygiene issue where Tenda F3 devices are deployed. Prioritize internet-adjacent or broadly reachable administration interfaces, then rotate credentials and reduce management-plane exposure while monitoring for vendor remediation.
Technical view
CVE-2026-27514 affects Tenda F3 firmware V12.01.01.55_multi configuration download behavior. The response includes router and administrative passwords in plaintext and lacks appropriate Cache-Control directives. CVSS 4.0 is 7.1 high, with network access, low privileges, no user interaction, and high confidentiality impact.
Likely exposure
Exposure is likely limited to organizations using Tenda F3 routers with the cited firmware. Risk is higher where router administration is reachable from user networks, shared devices are used for administration, or browser/proxy caches are accessible to other users or processes.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. Exploitation is described as requiring low privileges and no user interaction, but the available evidence should not be read as proof of exploitation in the wild.
Researcher notes
Affected-version metadata is incomplete in the bundle: the description names firmware V12.01.01.55_multi, while the affected versions list contains an unclear value of 0. No patch, workaround, or exploitation evidence is provided in the supplied sources.
Mitigation direction
- Check Tenda guidance and apply any firmware fix when available.
- Restrict router administration to trusted management networks only.
- Rotate router and administrator passwords after configuration downloads.
- Clear browser and proxy caches on systems used for administration.
- Avoid administering affected routers from shared or unmanaged endpoints.
Validation and detection
- Inventory Tenda F3 devices and record firmware versions.
- Confirm whether any device runs V12.01.01.55_multi.
- Review vendor and advisory pages for fixed firmware or guidance.
- In a controlled lab, inspect configuration-backup responses for plaintext credentials.
- Check administrative workstations for cached configuration downloads.
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-201: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. 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 lookupCWE-525: 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 lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-27514 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
- 7.1 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/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:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N——VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N2.83.6VulnCheckVulnerability scoring details
Base CVSS 4.0 score
7.1HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/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.
- 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
- https://www.tendacn.com/product/F3CVE reference, VulnCheck · product
- https://www.vulncheck.com/advisories/tenda-f3-plaintext-credential-exposure-in-configuration-downloadCVE 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.
Insertion of Sensitive Information Into Sent Data
Insertion of Sensitive Information Into Sent Data represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Use of Web Browser Cache Containing Sensitive Information
Use of Web Browser Cache Containing Sensitive Information represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.