Null pointer dereference vulnerability in D-Link DAP-2310 2,10RC039, DAP-2330 1.10RC036 BETA, DAP-2360 2.10RC055, DAP-2553 3.10rc039 BETA,…

published 2021-08-10 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-15492

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.2%; EPSS 2.2% chance of exploitation in 30 days, percentile 82%
public exploits: 0; none known

Null pointer dereference vulnerability in D-Link DAP-2310 2,10RC039, DAP-2330 1.10RC036 BETA, DAP-2360 2.10RC055, DAP-2553 3.10rc039 BETA, DAP-2660 1.15rc131b, DAP-2690 3.20RC115 BETA, DAP-2695 1.20RC093, DAP-3320 1.05RC027 BETA and DAP-3662 1.05rc069 in the sbin/httpd binary. The crash happens at the `atoi' operation when a specific network package are sent to the httpd binary.

Patch / fix

fixed in 5

dlink dap-2330_firmware 1.10rc036
dlink dap-2553_firmware 3.10rc039
dlink dap-2690_firmware 3.20rc115
dlink dap-3320_firmware 1.05rc027
dlink dap-3662_firmware 1.05rc069

Exploit prediction

2.22% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/zyw-200/EQUAFL/blob/main/dlink-email-cve.pdf referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

CWE-476 NULL Pointer Dereference

References

github.com /zyw-200/EQUAFL/blob/main/dlink-email-cve.pdf
exploit, third-party-advisory
dlink.com /en/security-bulletin/
vendor-advisory
github.com /zyw-200/EQUAFL/blob/main/dlink-email-cve2.pdf
third-party-advisory

Sources

CVE List CVE-2021-28838
NVD CVE-2021-28838

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary