How severe is CVE-2019-18852?

CVE-2019-18852 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-18852 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-18852?

CVE-2019-18852 primarily affects Dlink Dir-600 B1 Firmware. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-18852?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2019-18852 published?

CVE-2019-18852 was published on 2019-11-11 and last updated on 2026-06-17.

CVE-2019-18852

CVE-2019-18852 is a critical-severity vulnerability in Dlink Dir-600 B1 Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-319.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-319
Affected product: Dlink Dir-600 B1 Firmware
Published: 2019-11-11
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2019-18852?: 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.
How severe is CVE-2019-18852?: CVE-2019-18852 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-18852 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-18852?: CVE-2019-18852 primarily affects Dlink Dir-600 B1 Firmware. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-18852?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-18852 published?: CVE-2019-18852 was published on 2019-11-11 and last updated on 2026-06-17.

References

https://github.com/ChandlerChin/Dlink_vuls/blob/master/A%20hard%20coded%20telnet%20user%20was%20discovered%20in%20multiple%20Dlink%20routers.pdf

Affected products (7)

cpe:2.3:o:dlink:dir-600_b1_firmware:2.01:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dir-615_j1_firmware:100:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dir-645_a1_firmware:1.03:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dir-815_a1_firmware:1.01:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dir-823_a1_firmware:1.01:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dir-842_c1_firmware:3.00:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dir-890l_a1_firmware:1.03:*:*:*:*:*:*:*

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