HOMEVULNERABILITIESCVE-2020-25367
CRITICAL

CVE-2020-25367

CWE-78Published: November 4, 2021· Updated: Jul 9, 2026

9.8
CVSS v3.1

Official Description

A command injection vulnerability was discovered in the HNAP1 protocol in D-Link DIR-823G devices with firmware V1.0.2B05. An attacker is able to execute arbitrary web scripts via shell metacharacters in the Captcha field to Login.

NVD Source

Technical Analysis

CVE-2020-25367 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

dlink2 product(s)
dir-823g firmwaredir-823g
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://github.com/sek1th/iot/blob/master/dir823g_3.md
ADVISORYhttps://www.dlink.com/en/security-bulletin/
ADVISORYhttps://github.com/sek1th/iot/blob/master/dir823g_3.md
ADVISORYhttps://www.dlink.com/en/security-bulletin/

All References (4)

→
https://github.com/sek1th/iot/blob/master/dir823g_3.mdExploit · Third Party Advisory
→
https://www.dlink.com/en/security-bulletin/Not Applicable · Vendor Advisory
→
https://github.com/sek1th/iot/blob/master/dir823g_3.mdExploit · Third Party Advisory
→
https://www.dlink.com/en/security-bulletin/Not Applicable · Vendor Advisory

Quick Facts

CVE IDCVE-2020-25367
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-78
CISA KEVNo
Affected1 vendor(s)
PublishedNov 4, 2021

Related CVEs (CWE-78)

CVE-2015-2844
10.0
CVE-2015-2845
10.0
CVE-2012-2953
10.0
CVE-2013-6881
10.0
CVE-2009-1916
10.0
CVE-2009-20011
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-25367 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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