← Vulnerability feed

Vulnerability record · CVE-2018-12103 · published 5 July 2018

CVE-2018-12103: Dlink dir-890l firmware incorrect authorization vulnerability

Dlink · Dir 890l Firmware

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.

6.5 CVSS 3.0 Medium EPSS 0.45% · top 63.2% CWE-863 · Incorrect authorization
6.5CVSS 3.0 base score, v2 3.3
0.45%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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.

CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://seclists.org/fulldisclosure/2018/Jul/13 Mailing ListThird Party Advisory
https://securityadvisories.dlink.com/announcement/publication.aspx?name=SAP10099 Vendor Advisory
http://seclists.org/fulldisclosure/2018/Jul/13 Mailing ListThird Party Advisory
https://securityadvisories.dlink.com/announcement/publication.aspx?name=SAP10099 Vendor Advisory

Track CVE-2018-12103 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2019-17621D-Link DIR-859 UPnP gena.cgi unauthenticated command injectionThe UPnP endpoint /gena.cgi on D-Link DIR-859 firmware 1.05 and 1.06B01 Beta01 fails to sanitize input in an HTTP SUBSCRIBE request, allowing OS comm…KEVEPSS 90%analysed9.8CVE-2022-30521Dlink dir-890l firmware out-of-bounds write vulnerabilityThe LAN-side Web-Configuration Interface has Stack-based Buffer Overflow vulnerability in the D-Link Wi-Fi router firmware DIR-890L DIR890LA1_FW107b0…EPSS 15%9.8CVE-2017-14948Dlink dir-868l firmware classic buffer overflow vulnerabilityCertain D-Link products are affected by: Buffer Overflow. This affects DIR-880L 1.08B04 and DIR-895 L/R 1.13b03. The impact is: execute arbitrary cod…EPSS 4.9%9.8CVE-2016-6563D-Link DIR routers stack buffer overflow via HNAP SOAP loginMalformed SOAP messages sent to the HNAP Login action overflow a stack buffer in several D-Link DIR router models. The vulnerable XML fields are Acti…EPSS 80%analysed8.8CVE-2022-29778Dlink dir-890l firmware hard-coded credentials vulnerabilityD-Link DIR-890L 1.20b01 allows attackers to execute arbitrary code due to the hardcoded option Wake-On-Lan for the parameter 'descriptor' at SetVirtu…EPSS 2.7%7.5CVE-2023-30063Dlink dir-890l firmware improper authentication vulnerabilityD-Link DIR-890L FW1.10 A1 is vulnerable to Authentication bypass.EPSS 1.1%7.5CVE-2019-20213Dlink dir-859 firmware injection vulnerabilityD-Link DIR-859 routers before v1.07b03_beta allow Unauthenticated Information Disclosure via the AUTHORIZED_GROUP=1%0a value, as demonstrated by vpnc…EPSS 2.2%5.3CVE-2025-4340Dlink dir-806 firmware injection vulnerabilityA vulnerability classified as critical has been found in D-Link DIR-890L and DIR-806A1 up to 100CNb11/108B03. Affected is the function sub_175C8 of t…EPSS 4.9%

Source: NIST National Vulnerability Database (record CVE-2018-12103), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.