Security readout for executives and security teams
Plain-English summary
CVE-2026-1158 is a critical buffer overflow in Totolink LR350 firmware 9.3.5u.6369_B20220309. A remote, authenticated attacker could potentially take full control of the device. Public exploit material is reported, but the provided sources do not show confirmed active exploitation or a vendor patch.
Executive priority
Treat this as urgent for any confirmed Totolink LR350 deployment. Public exploit availability and potential full device compromise justify rapid inventory, exposure reduction, and vendor patch tracking. If the product is not present, no action is needed beyond routine monitoring.
Technical view
The flaw affects setWizardCfg in /cgi-bin/cstecgi.cgi, specifically handling of the ssid argument in POST requests. VulDB rates it CVSS 9.0 under CVSS v2 with network access, low complexity, single authentication, and complete confidentiality, integrity, and availability impact. CWEs listed are CWE-119 and CWE-120.
Likely exposure
Exposure is limited to Totolink LR350 devices running firmware 9.3.5u.6369_B20220309. Risk is higher where the router management interface is reachable from untrusted networks or weakly controlled user access exists.
Exploitation context
The source bundle says exploitation can be initiated remotely and that exploit material has been released publicly. It does not cite CISA KEV listing or confirmed in-the-wild exploitation. The CVSS vector indicates authentication is required.
Researcher notes
Evidence is primarily from CVE/VulDB-style records and a linked public write-up. The bundle identifies one firmware version only. No official Totolink fix, workaround, or active exploitation confirmation is included. Avoid broad assumptions about other Totolink models or firmware versions.
Mitigation direction
- Identify Totolink LR350 devices and firmware versions in the environment.
- Check Totolink advisories and support channels for patched firmware or official mitigation.
- Restrict router administration interfaces to trusted management networks only.
- Disable remote administration if not explicitly required.
- Use strong, unique administrator credentials and remove unnecessary accounts.
- Monitor for suspicious router configuration changes or unexpected reboots.
Validation and detection
- Confirm whether any LR350 device runs firmware 9.3.5u.6369_B20220309.
- Review exposure of /cgi-bin/cstecgi.cgi administration endpoints from untrusted networks.
- Verify administrative access requires authentication and is limited to trusted users.
- Check logs for unusual configuration activity involving wireless setup changes.
- Track VulDB and Totolink for updated remediation details.
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-120: 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-2026-1158 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 (2.0)
- Known Exploited
- No
- Published
Vector: AV:N/AC:L/Au:S/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.
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.
AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR810Primary CVE scoreVulnerability scoring details
Base CVSS 2.0 score
9CriticalVector: AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
Source materials
- CVE List V5 sourceCVE List V5
- VDB-341752 | Totolink LR350 POST Request cstecgi.cgi setWizardCfg buffer overflowCVE reference · vdb-entry, technical-description
- VDB-341752 | CTI Indicators (IOB, IOC, IOA)CVE reference · signature, permissions-required
- Submit #735728 | TOTOLINK LR350 LR350 V9.3.5u.6369_B20220309 Buffer OverflowCVE reference · third-party-advisory
- https://lavender-bicycle-a5a.notion.site/TOTOLINK-LR350-setWizardCfg-2e453a41781f80ce89cfc1d25049e279?source=copy_linkCVE reference · exploit
- https://www.totolink.net/CVE reference · 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.
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.