CVE-2021-43722

9.8 criticalEPSS 3.2%

Critical (9.8) in dlink dir-645 firmware. EPSS 3.2% chance of exploitation in the next 30 days.

D-Link DIR-645 1.03 A1 is vulnerable to Buffer Overflow. The hnap_main function in the cgibin handler uses sprintf to format the soapaction header onto the stack and has no limit on the size.

Severity

CVSS 3.1

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 3.2% chance of exploitation in the next 30 days; higher than 87% of CVEs (scores of 2026-10-31)
CWE: CWE-787
Published: 2022-03-31
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

dlink:dir-645_firmware

References

https://github.com/luqiut/iot/blob/main/DIR-645%20Stack%20overflow.md
https://www.dlink.com/en/security-bulletin/
https://github.com/luqiut/iot/blob/main/DIR-645%20Stack%20overflow.md
https://www.dlink.com/en/security-bulletin/

Check your stack JSON