What’s Vulnerable › Vulnerabilities

CVE-2020-9276

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-04-20 · updated 2026-06-17
• Weakness: CWE-787

Description

An issue was discovered on D-Link DSL-2640B B2 EU_4.01B devices. The function do_cgi(), which processes cgi requests supplied to the device's web servers, is vulnerable to a remotely exploitable stack-based buffer overflow. Unauthenticated exploitation is possible by combining this vulnerability with CVE-2020-9277.

Affected products

• Dlink Dsl-2640B Firmware: eu_4.01b

References

• https://raelize.com/advisories/CVE-2020-9276_D-Link-DSL-2640B_do_cgi-buffer-overflow_v1.0.txt
• https://raelize.com/posts/d-link-dsl-2640b-security-advisories/
• https://www.dlink.com/en/security-bulletin
• https://raelize.com/advisories/CVE-2020-9276_D-Link-DSL-2640B_do_cgi-buffer-overflow_v1.0.txt
• https://raelize.com/posts/d-link-dsl-2640b-security-advisories/
• https://www.dlink.com/en/security-bulletin

Get alerted when CVE-2020-9276 or the next vulnerability affects your stack