HOMEVULNERABILITIESCVE-2018-12103
MEDIUM

CVE-2018-12103

CWE-863Published: July 5, 2018· Updated: Jun 17, 2026

6.5
CVSS v3.1

Official Description

An issue was discovered on D-Link DIR-890L with firmware 1.21B02beta01 and earlier, DIR-885L/R with firmware 1.21B03beta01 and earlier, and DIR-895L/R with firmware 1.21B04beta04 and earlier devices (all hardware revisions). Due to the predictability of the /docs/captcha_(number).jpeg URI, being local to the network, but unauthenticated to the administrator's panel, an attacker can disclose the CAPTCHAs used by the access point and can elect to load the CAPTCHA of their choosing, leading to unauthorized login attempts to the access point.

NVD Source

Technical Analysis

CVE-2018-12103 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

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 full integrity compromise (data manipulation), with a CVSS base score of 6.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorAdjacent
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected Vendors & Products

d-link4 product(s)
dir-885l\/r firmwaredir-885\/rdir-895l\/r firmwaredir-895\/r
dlink2 product(s)
dir-890l firmwaredir-890l
Source: NVD CPE · 6 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

ADVISORYhttp://seclists.org/fulldisclosure/2018/Jul/13
ADVISORYhttps://securityadvisories.dlink.com/announcement/publication.aspx?name=SAP10099
ADVISORYhttp://seclists.org/fulldisclosure/2018/Jul/13
ADVISORYhttps://securityadvisories.dlink.com/announcement/publication.aspx?name=SAP10099

All References (4)

→
http://seclists.org/fulldisclosure/2018/Jul/13Mailing List · Third Party Advisory
→
https://securityadvisories.dlink.com/announcement/publication.aspx?name=SAP10099Vendor Advisory
→
http://seclists.org/fulldisclosure/2018/Jul/13Mailing List · Third Party Advisory
→
https://securityadvisories.dlink.com/announcement/publication.aspx?name=SAP10099Vendor Advisory

Quick Facts

CVE IDCVE-2018-12103
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-863
CISA KEVNo
Affected2 vendor(s)
PublishedJul 5, 2018

Related CVEs (CWE-863)

CVE-2026-44330
10.0
CVE-2023-4617
10.0
CVE-2018-18815
10.0
CVE-2026-48303
10.0
CVE-2026-48286
10.0
CVE-2021-38503
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-12103 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.COM. CVE data is provided under the NVD usage policy.
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