Patchfirst
CVE-2026-42021 Critical · 9.1 EPSS 0.5%

Multiple stack-based buffer overflow vulnerabilities exist in the boa formIpv6Setup static network configuration…

totolink · Totolink

Summary

A stack-based buffer overflow in the boa web server's formIpv6Setup static network configuration functionality of Totolink X2000R router firmware (TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327) is triggered through the static_dns1 parameter. An attacker with network access to the device and valid authentication can send a specially crafted HTTP request to achieve arbitrary code execution.

Official description · NVD

Multiple stack-based buffer overflow vulnerabilities exist in the boa formIpv6Setup static network configuration functionality of Totolink X2000R TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327. A specially crafted HTTP request can lead to arbitrary code execution. An attacker can make an authenticated HTTP request to trigger these vulnerabilities. This vulnerability concerns the static_dns1 parameter.

Breakdown
16.5 / 100
Exploited
Not confirmed
Reports
0
Tactics
0/15

Disclosed on 20 Oct 2026. No public exploit code or confirmed exploitation is recorded.

techniques

No techniques linked

No ATT&CK techniques are linked to this CVE yet. MITRE CTID has not mapped it, and no report passage in the corpus ties it to a technique.

What security researchers reported

Not named in any threat report yet

Also mentioned in 6 community threat pulses (AlienVault OTX)

Weaker evidence

Pulses are indicator collections that anyone can publish. A mention is not confirmation of exploitation.

References

1 link, grouped by NVD tag
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