Security readout for executives and security teams
Plain-English summary
A critical flaw in specific D-Link DWR-M961 routers could let an unauthenticated remote attacker take control of the device or crash it. Confirmed scope is hardware revision C1 running software 1.1.2_C1_202602110044. Compromise could expose traffic, alter network behavior, or interrupt connectivity.
Executive priority
Prioritize immediate identification and containment of affected, remotely reachable routers. Apply D-Link's supported remediation as soon as confirmed. Where remediation is unavailable, isolate or replace the device because successful exploitation could enable full router compromise and business connectivity disruption.
Technical view
CVE-2026-71957 is a CWE-120 buffer overflow in the app.cgi interface. An oversized netAcc.addlist[].name value can cause arbitrary command execution or denial of service. CVSS 3.1 rates it 9.8: network-accessible, low complexity, no privileges, and no user interaction.
Likely exposure
Exposure is highest where an affected router's app.cgi management interface is reachable from untrusted networks. Devices limited to trusted administrative networks have reduced reachability but remain vulnerable to attackers with network access. The supplied evidence confirms only DWR-M961 hardware C1 with software 1.1.2_C1_202602110044.
Exploitation context
The source bundle does not identify this CVE as CISA KEV and provides no evidence of active exploitation. It does establish unauthenticated remote command execution and device-crash potential. Treat reachable affected devices urgently without claiming exploitation has occurred.
Researcher notes
The reported sink is netAcc.addlist[].name within app.cgi, with outcomes including command execution and crash. The bundle does not provide fixed-version details, observed exploitation, or complete interface exposure requirements. Validate defensively using inventory, configuration, reachability, logs, and vendor guidance; avoid production crash testing.
Mitigation direction
- Inventory DWR-M961 routers and identify hardware revision and installed software version.
- Follow D-Link SAP10512 for applicable firmware or remediation; the supplied sources do not name a fixed version.
- Disable WAN-facing management access where enabled.
- Restrict administration interfaces to trusted management networks and authorized hosts.
- Isolate or replace affected devices that cannot receive vendor-supported remediation.
Validation and detection
- Confirm each device is DWR-M961 hardware C1 and record its exact software version.
- Verify whether app.cgi is reachable from WAN, guest, user, or other untrusted network segments.
- After remediation, confirm the installed version matches D-Link's advisory guidance.
- Review device logs for unexplained crashes, restarts, configuration changes, or administrative activity.
- Recheck network controls to ensure management access is limited to approved sources.
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-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-2026-71957 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
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——VulnCheckVulnerability 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
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
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
- D-Link AdvisoryCVE reference, VulnCheck · vendor-advisory, patch
- Product WebpageCVE reference, VulnCheck · product
- https://www.vulncheck.com/advisories/d-link-dwr-m961-buffer-overflow-via-app-cgiCVE 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.
Buffer Copy without Checking Size of Input
Buffer Copy without Checking Size of Input represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.