← Vulnerability feed

Vulnerability record · CVE-2026-76070 · published 24 August 2026

CVE-2026-76070: Stack-based buffer overflow vulnerability

Netis NC63 firmware through V3.0.0.3327 contains a stack-based buffer overflow vulnerability that allows unauthenticated remote attackers to overwrite saved stack state by submitting an oversized Base64-encoded password to the login handler in /bin/netis.cgi. Attackers can exploit the custom Base64 decoder's lack of output length validation against the fixed-size stack buffer to achieve remote code execution with root privileges, as the Boa web server executes the CGI environment as root.

9.3 CVSS 4.0 Critical EPSS 1.3% · top 29.9% CWE-121 · Stack-based buffer overflow Deferred
9.3CVSS 4.0 base score
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
24 Sep 2026Last modified by NVD

Description

Netis NC63 firmware through V3.0.0.3327 contains a stack-based buffer overflow vulnerability that allows unauthenticated remote attackers to overwrite saved stack state by submitting an oversized Base64-encoded password to the login handler in /bin/netis.cgi. Attackers can exploit the custom Base64 decoder's lack of output length validation against the fixed-size stack buffer to achieve remote code execution with root privileges, as the Boa web server executes the CGI environment as root.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/ozcanpng/CVE-2026-76070
https://ozcanpng.dev/blog/cve-2026-76070-netis-nc63-login-stack-buffer-overflow/
https://www.netis-systems.com/products/NC63.html
https://www.vulncheck.com/advisories/netis-nc63-stack-buffer-overflow-via-login-password-parameter

Track CVE-2026-76070 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2026-7273Zyxel gs1900-8 firmware stack-based buffer overflow vulnerabilityA stack-based buffer overflow vulnerability in the CGI program of Zyxel GS1900-48HPv2 firmware versions through 2.90(ABTQ.1)C0 could allow a LAN-base…KEVEPSS 2.5%8.1CVE-2021-27137DD-WRT UPnP M-SEARCH stack buffer overflowDD-WRT before 45724 contains an unsafe strcpy in the UPnP SSDP handling code (ssdp_msearch), reachable via an M-SEARCH request, that overflows a fixe…KEVEPSS 4.0%analysed9.3CVE-2025-53521F5 BIG-IP APM stack buffer overflow allows remote code executionA stack-based buffer overflow (CWE-121) exists in F5 BIG-IP Access Policy Manager when an APM access policy is configured on a virtual server. Specif…KEVEPSS 2.3%analysed8.8CVE-2008-0015Microsoft DirectShow Video ActiveX Control Stack Buffer OverflowA stack-based buffer overflow in the CComVariant::ReadFromStream function in the Active Template Library (ATL) is reachable through the MPEG2TuneRequ…KEVEPSS 77%analysed7.7CVE-2025-20352Cisco IOS and IOS XE SNMP stack overflow allows DoS and root code executionA stack-based buffer overflow in the SNMP subsystem of Cisco IOS and IOS XE Software can be triggered by a crafted SNMP packet sent over IPv4 or IPv6…KEVEPSS 39%analysed9.8CVE-2025-32756Fortinet FortiMail, FortiNDR, FortiVoice, FortiRecorder, FortiCamera stack buffer overflowA stack-based buffer overflow (CWE-121/CWE-787) in multiple Fortinet products is reachable by sending HTTP requests with a specially crafted hash coo…KEVEPSS 30%analysed9.8CVE-2025-42599Qualitia Active! mail stack buffer overflow allows remote code executionActive! mail 6 (BuildInfo 6.60.05008561 and earlier) contains a stack-based buffer overflow (CWE-121). A remote unauthenticated attacker can trigger …KEVEPSS 3.3%analysed9.8CVE-2025-22457Ivanti Connect Secure, Policy Secure and ZTA Gateways stack buffer overflow RCEA stack-based buffer overflow (CWE-121/CWE-787) in Ivanti Connect Secure, Policy Secure and ZTA Gateways allows a remote, unauthenticated attacker to…KEVEPSS 100%analysed

Source: NIST National Vulnerability Database (record CVE-2026-76070), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.