D-Link DIR routers contain a stack-based buffer overflow in the HNAP Login action

published 2018-07-13 8 y ago modified 2026-06-17 4 mo ago also EUVD-2016-7484

cvss: 9.8; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 79.7%; EPSS 79.7% chance of exploitation in 30 days, percentile 99.6%
public exploits: 2; Metasploit, Exploit-DB

Processing malformed SOAP messages when performing the HNAP Login action causes a buffer overflow in the stack in some D-Link DIR routers. The vulnerable XML fields within the SOAP body are: Action, Username, LoginPassword, and Captcha. The following products are affected: DIR-823, DIR-822, DIR-818L(W), DIR-895L, DIR-890L, DIR-885L, DIR-880L, DIR-868L, and DIR-850L.

Timeline

2016-11-07 First public exploit (Metasploit exploit/linux/http/dlink_hnap_login_bof)
2018-07-13 Published

Exploit prediction

79.73% chance of exploitation in the next 30 days, higher than 99.6% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

Metasploit exploit/linux/http/dlink_hnap_login_bof Dlink DIR Routers Unauthenticated HNAP Login Stack Buffer Overflow metasploit exploit, excellent rank, 2016-11-07
EDB-40805 D-Link DIR-Series Routers - HNAP Login Stack Buffer Overflow (Metasploit) remote, 2016-11-21
seclists.org http://seclists.org/fulldisclosure/2016/Nov/38 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	9.8	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	10.0	AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected products

D-Link DIR-823
D-Link DIR-822
D-Link DIR-818L(W)
D-Link DIR-895L
D-Link DIR-890L
D-Link DIR-885L
D-Link DIR-880L
D-Link DIR-868L
D-Link DIR-850L

Classification

Weakness

CWE-121 Stack-based Buffer Overflow
CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

exploit-db.com /exploits/40805/
exploit, third-party-advisory, vdb-entry
seclists.org /fulldisclosure/2016/Nov/38
mailing-list, exploit, third-party-advisory
kb.cert.org /vuls/id/677427
third-party-advisory, us-government-resource
securityfocus.com /bid/94130
vdb-entry, third-party-advisory

Sources

CVE List CVE-2016-6563
NVD CVE-2016-6563

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