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CVE Record

CVE-2026-1155: Totolink LR350 cstecgi.cgi setWiFiEasyGuestCfg buffer overflow

A vulnerability was found in Totolink LR350 9.3.5u.6369_B20220309. Affected by this vulnerability is the function setWiFiEasyGuestCfg of the file /cgi-bin/cstecgi.cgi. The manipulation of the argument ssid results in buffer overflow. The attack may be performed from remote. The exploit has been made public and could be used.

CriticalCVSS 9Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

CVE-2026-1155 is a critical buffer overflow in Totolink LR350 firmware. A remote authenticated attacker could manipulate a Wi-Fi guest SSID setting and potentially take full control of the device. Public proof-of-concept exploit information is reported, but no source confirms active exploitation or a vendor fix.

Executive priority

Treat as urgent for any deployed Totolink LR350. Prioritize removing remote management exposure and confirming firmware status. Business risk is highest where these routers protect offices, branches, or guest networks.

Technical view

VulDB reports a buffer overflow in /cgi-bin/cstecgi.cgi, function setWiFiEasyGuestCfg, caused by the ssid argument on Totolink LR350 9.3.5u.6369_B20220309. CVSS v2 is 9.0 with network access, low complexity, and single authentication. CWE-119 and CWE-120 are assigned.

Likely exposure

Exposure is limited to Totolink LR350 devices running firmware 9.3.5u.6369_B20220309, especially where the management CGI interface is reachable from untrusted networks.

Exploitation context

The source bundle says exploit details are public and could be used. KEV is false, and the provided sources do not confirm active exploitation in the wild.

Researcher notes

Evidence comes primarily from VulDB and a linked public exploit write-up. The CVSS vector indicates authentication is required. No official patch, workaround, or active exploitation confirmation is present in the provided sources.

Mitigation direction

  • Check Totolink guidance for updated firmware or official remediation.
  • Remove internet exposure for LR350 management interfaces.
  • Restrict device administration to trusted networks and users.
  • Replace affected devices if no supported fixed firmware is available.
  • Review configurations for unnecessary remote administration access.

Validation and detection

  • Inventory Totolink LR350 devices and record firmware versions.
  • Identify any LR350 running 9.3.5u.6369_B20220309.
  • Confirm whether /cgi-bin/cstecgi.cgi is reachable from untrusted networks.
  • Review administrative access logs for unusual guest Wi-Fi configuration changes.
  • Monitor vendor and VulDB pages for updated remediation details.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · low confidence lookup

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.

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cwe · low confidence lookup

CWE-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 lookup
cve · low confidence lookup

CVE-2026-1155 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
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

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
6Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
9CVSS 2.0CriticalAV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR810Primary CVE score

Vulnerability scoring details

Base CVSS 2.0 score

9Critical
CVSS 2.0 vector shape for CVE-2026-1155Access VectorAccess ComplexityAuthenticationConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR

Access Vector
NetworkAdjacentLocal
Access Complexity
LowMediumHigh
Authentication
NoneSingleMultiple
Confidentiality Impact
CompletePartialNone
Integrity Impact
CompletePartialNone
Availability Impact
CompletePartialNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
TotolinkLR3509.3.5u.6369_B20220309Listed
Weakness

CWE details

CWE-119CWE-120

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.