Security readout for executives and security teams
Plain-English summary
This CVE affects Totolink NR1800X routers on firmware 9.1.0u.6279_B20210910. A remote unauthenticated attacker may trigger a stack-based buffer overflow through the lighttpd logout handler. Public exploit material is referenced, but the bundle does not show confirmed active exploitation.
Executive priority
Treat this as urgent for any deployed NR1800X on the affected firmware. The issue is remotely reachable, unauthenticated, rated critical, and has public exploit material. Reduce exposure immediately while awaiting or confirming vendor remediation.
Technical view
VulDB describes a stack-based buffer overflow in Form_Logout, served by /formLogout.htm in the lighttpd component. Manipulating the Host argument can trigger memory corruption remotely. The CVSS v2 score is 10.0 with network access, low complexity, no authentication, and complete confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to Totolink NR1800X devices running firmware 9.1.0u.6279_B20210910, especially where the router web service is reachable from untrusted networks. The source bundle does not identify other Totolink models or firmware versions as affected.
Exploitation context
The source bundle says exploit code has been made public and could be used for attacks. KEV status is false, and no cited source in the bundle confirms active exploitation in the wild.
Researcher notes
Evidence comes from VulDB and CVE-linked records. The bundle names Form_Logout in /formLogout.htm, the Host argument, CWE-119/CWE-121, and public exploit availability. It does not provide a vendor advisory, patch version, confirmed exploitation, or broader affected-version evidence.
Mitigation direction
- Check Totolink guidance for patched firmware or an official workaround.
- Remove untrusted network access to the router web interface where possible.
- Restrict management access to trusted administrative networks only.
- Prioritize replacement or isolation if no vendor fix is available.
- Monitor vendor and CVE records for updates.
Validation and detection
- Inventory Totolink NR1800X devices and record firmware versions.
- Confirm whether firmware 9.1.0u.6279_B20210910 is deployed.
- Review firewall rules for exposure of the device web interface.
- Check logs for unexpected access to /formLogout.htm where available.
- Track VulDB, CVE, and Totolink sources for remediation updates.
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-119: 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 lookupCWE-121: 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 lookupCVE-2026-15701 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
- 10 (2.0)
- Known Exploited
- No
- Published
Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
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
4 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.
AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR1010VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R3.95.9VulDBCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R3.95.9VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P——VulDBVulnerability scoring details
Base CVSS 4.0 score
9.3CriticalVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
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/E:P/RL:X/RC:R
Base CVSS 2.0 score
10CriticalVector: AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- Source timelineVulDB
Advisory disclosed
- Source timelineVulDB
VulDB entry created
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- Source timelineVulDB
VulDB entry last update
- 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
- VDB-378248 | Totolink NR1800X lighttpd formLogout.htm Form_Logout stack-based overflowCVE reference, VulDB · vdb-entry, technical-description
- VDB-378248 | CTI Indicators (IOB, IOC, IOA)CVE reference, VulDB · signature, permissions-required
- CVE-2026-15701 | CVE Analysis and ReportCVE reference, VulDB · third-party-advisory
- Submit #856136 | TOTOLINK TOTOLINK NR1800X V9.1.0u.6279_B20210910 V9.1.0u.6279_B20210910 Buffer OverflowCVE reference, VulDB · third-party-advisory
- https://github.com/fu9-dotom/cve/issues/1CVE reference, VulDB · exploit, issue-tracking
- https://www.totolink.net/CVE reference, VulDB · product
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 Restriction of Operations within the Bounds of a Memory Buffer
Improper Restriction of Operations within the Bounds of a Memory Buffer represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Stack-based Buffer Overflow
Stack-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.