Security readout for executives and security teams
Plain-English summary
CVE-2026-1157 is a critical buffer overflow in the Totolink LR350 router firmware. A remote attacker with required access could abuse Wi-Fi easy configuration handling to crash or potentially take control of the device. Public proof-of-concept exploit material is referenced, but the provided sources do not show confirmed active exploitation.
Executive priority
Prioritize this for network edge asset review. Routers often sit in trusted positions and compromise can affect traffic, availability, and downstream systems. Urgency is highest if LR350 devices are remotely manageable or exposed beyond a restricted admin network.
Technical view
The issue affects Totolink LR350 firmware 9.3.5u.6369_B20220309 in /cgi-bin/cstecgi.cgi, function setWiFiEasyCfg. Manipulation of the ssid argument can trigger a buffer overflow. VulDB scores it CVSS 2.0 9.0 with network attack vector, low complexity, and single authentication required. CWE mappings include CWE-119 and CWE-120.
Likely exposure
Exposure is likely limited to Totolink LR350 devices running firmware 9.3.5u.6369_B20220309, especially where management interfaces or related CGI endpoints are reachable from untrusted networks. The CVSS vector indicates authentication is required, reducing but not removing risk.
Exploitation context
The source bundle states the attack can be launched remotely and that exploit material is publicly available. It does not provide evidence of known exploited-in-the-wild status, and KEV is false. Treat internet-facing or weakly protected router administration surfaces as urgent review targets.
Researcher notes
Evidence is mainly from CVE/VulDB-style reporting and a linked public exploit write-up. No official patch, workaround, or vendor advisory is included in the provided sources. The CVSS vector lists Au:S, so validation should distinguish authenticated management exposure from unauthenticated internet exposure.
Mitigation direction
- Identify Totolink LR350 devices and firmware versions in the environment.
- Restrict administrative and CGI interface access to trusted management networks only.
- Disable remote administration from the internet where possible.
- Check Totolink guidance for firmware updates or official mitigations.
- Replace or isolate affected devices if no vendor fix is available.
Validation and detection
- Inventory LR350 routers and confirm firmware version 9.3.5u.6369_B20220309.
- Review whether /cgi-bin/cstecgi.cgi is reachable from untrusted networks.
- Confirm administrative access requires strong authentication and is not internet-exposed.
- Monitor router logs for unusual Wi-Fi configuration changes or management access.
- Track CVE, VulDB, and Totolink pages for updated remediation information.
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-2026-1157 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-341751 | Totolink LR350 cstecgi.cgi setWiFiEasyCfg buffer overflowCVE reference · vdb-entry, technical-description
- VDB-341751 | CTI Indicators (IOB, IOC, IOA)CVE reference · signature, permissions-required
- Submit #735726 | TOTOLINK LR350 LR350 V9.3.5u.6369_B20220309 Buffer OverflowCVE reference · third-party-advisory
- https://lavender-bicycle-a5a.notion.site/TOTOLINK-LR350-setWiFiEasyCfg-2e453a41781f80b7b53cef33c6a782aa?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.