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Vulnerability record · CVE-2019-18852 · published 11 November 2019

CVE-2019-18852: Dlink dir-600 b1 firmware cleartext transmission vulnerability

Dlink · Dir 600 B1 Firmware

Certain D-Link devices have a hardcoded Alphanetworks user account with TELNET access because of /etc/config/image_sign or /etc/alpha_config/image_sign. This affects DIR-600 B1 V2.01 for WW, DIR-890L A1 v1.03, DIR-615 J1 v100 (for DCN), DIR-645 A1 v1.03, DIR-815 A1 v1.01, DIR-823 A1 v1.01, and DIR-842 C1 v3.00.

9.8 CVSS 3.1 Critical EPSS 1.6% · top 25.0% CWE-319 · Cleartext transmission
9.8CVSS 3.1 base score, v2 10.0
1.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
7Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Certain D-Link devices have a hardcoded Alphanetworks user account with TELNET access because of /etc/config/image_sign or /etc/alpha_config/image_sign. This affects DIR-600 B1 V2.01 for WW, DIR-890L A1 v1.03, DIR-615 J1 v100 (for DCN), DIR-645 A1 v1.03, DIR-815 A1 v1.01, DIR-823 A1 v1.01, and DIR-842 C1 v3.00.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

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

References

LinkTags
https://github.com/ChandlerChin/Dlink_vuls/blob/master/A%20hard%20coded%20telnet%20user%20was%20discovered%20in%20multip ExploitThird Party Advisory
https://github.com/ChandlerChin/Dlink_vuls/blob/master/A%20hard%20coded%20telnet%20user%20was%20discovered%20in%20multip ExploitThird Party Advisory

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Related vulnerabilities

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

9.8CVE-2021-42627D-Link DIR-615 WAN page exposed without authenticationThe WAN configuration page wan.htm on D-Link DIR-615 devices running firmware 20.06 is reachable directly without authentication. An unauthenticated …EPSS 63%analysed9.8CVE-2017-12943Dlink dir-600 b1 firmware path traversal vulnerabilityD-Link DIR-600 Rev Bx devices with v2.x firmware allow remote attackers to read passwords via a model/__show_info.php?REQUIRE_FILE= absolute path tra…EPSS 39%

Source: NIST National Vulnerability Database (record CVE-2019-18852), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.