CVE-2016-6563

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
9.8EG
EchelonGraph verdictMitigate this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 80%
  • Public exploit code is available (Metasploit, Exploit-DB (verified), epss top5pct, epss high, public exploit)
CISA-KEV: Not listedEPSS PROB: 80%CVSS: 9.8Exploit: Metasploit · Exploit-DB (verified) · epss top5pct · epss high · public exploitExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

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.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
80
EG Risk 80/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation80% × 40%
Automatability30% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
80%
EPSS %ILE
99th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (EG-KEV: weaponized) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 13, 2018

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Oct 7, 2026
🔬 Proof of concept available. No fix on record yet. Sources: cert.
cert

VU#677427 - D-Link routers HNAP service contains stack-based buffer overflow

https://www.kb.cert.org/vuls/id/677427
generic🟡 PoC Available

D-Link DIR-Series Routers - HNAP Login Stack Buffer Overflow (Metasploit) - Multiple remote Exploit

https://www.exploit-db.com/exploits/40805/
generic

Full Disclosure: [CVE-2016-6563 / VU#677427]: Dlink DIR routers HNAP Login stack buffer overflow

http://seclists.org/fulldisclosure/2016/Nov/38
generic

CVE-2016-6563 - PSIRT.COM

http://www.securityfocus.com/bid/94130

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 3× in last 7d / 16× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-09 20:01 UTCEPSS rescore
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  50. 2026-05-28 05:14 UTCEG score recompute
  51. 2026-05-28 05:14 UTCGHSA enrichment

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 Metasploit module) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-40805✓ verified
    First seen Nov 21, 2016

    D-Link DIR-Series Routers - HNAP Login Stack Buffer Overflow (Metasploit)

    Open source ↗
  • Metasploitexploit/linux/http/dlink_hnap_login_bof✓ verified
    First seen Nov 7, 2016

    Dlink DIR Routers Unauthenticated HNAP Login Stack Buffer Overflow

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2016-6563?
CVE-2016-6563 is a critical vulnerability published on July 13, 2018. 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,…
When was CVE-2016-6563 disclosed?
CVE-2016-6563 was first published on July 13, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-6563 actively exploited?
CVE-2016-6563 is not currently on CISA's Known Exploited Vulnerabilities catalog. EchelonGraph's EG-KEV model classifies it as weaponized: a functional public exploit exists. FIRST EPSS estimates a 80% probability of exploitation in the next 30 days (99th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2016-6563?
CVE-2016-6563 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2016-6563?
No fix for CVE-2016-6563 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix.

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