How severe is CVE-2019-6258?

CVE-2019-6258 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-2019-6258 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-6258?

CVE-2019-6258 affects D-link Dir-822 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-6258?

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-2019-6258 published?

CVE-2019-6258 was published on 2020-08-18 and last updated on 2026-06-17.

CVE-2019-6258

CVE-2019-6258 is a critical-severity vulnerability in D-link Dir-822 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-120.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: D-link Dir-822 Firmware
Published: 2020-08-18
Last modified: 2026-06-17

Description

D-Link DIR-822 Rev.Bx devices with firmware v.202KRb06 and older allow a buffer overflow via long MacAddress data in a /HNAP1/SetClientInfo HNAP protocol message, which is mishandled in /usr/sbin/udhcpd during reading of the /var/servd/LAN-1-udhcpd.conf file.

Frequently asked questions

What is CVE-2019-6258?: D-Link DIR-822 Rev.Bx devices with firmware v.202KRb06 and older allow a buffer overflow via long MacAddress data in a /HNAP1/SetClientInfo HNAP protocol message, which is mishandled in /usr/sbin/udhcpd during reading of the /var/servd/LAN-1-udhcpd.conf file.
How severe is CVE-2019-6258?: CVE-2019-6258 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-2019-6258 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-6258?: CVE-2019-6258 affects D-link Dir-822 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-6258?: 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-2019-6258 published?: CVE-2019-6258 was published on 2020-08-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:d-link:dir-822_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in D-link Dir-822 Firmware

CVE-2018-19990 — Critical (CVSS 9.8): In the /HNAP1/SetWiFiVerifyAlpha message, the WPSPIN parameter is vulnerable, and the vulnerability affects D-Link…
CVE-2018-19989 — Critical (CVSS 9.8): In the /HNAP1/SetQoSSettings message, the uplink parameter is vulnerable, and the vulnerability affects D-Link DIR-822…
CVE-2018-19987 — Critical (CVSS 9.8): D-Link DIR-822 Rev.B 202KRb06, DIR-822 Rev.C 3.10B06, DIR-860L Rev.B 2.03.B03, DIR-868L Rev.B 2.05B02, DIR-880L Rev.A…
CVE-2018-19986 — Critical (CVSS 9.8): In the /HNAP1/SetRouterSettings message, the RemotePort parameter is vulnerable, and the vulnerability affects D-Link…

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