How severe is CVE-2016-6563?

CVE-2016-6563 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-2016-6563 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 80% (100th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-6563?

CVE-2016-6563 primarily affects Dlink Dir-823 Firmware. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-6563?

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-2016-6563 published?

CVE-2016-6563 was published on 2018-07-13 and last updated on 2026-06-17.

CVE-2016-6563

CVE-2016-6563 is a critical-severity vulnerability in Dlink Dir-823 Firmware with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 80% places it in the 100th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 80% (100th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Dlink Dir-823 Firmware
Published: 2018-07-13
Last modified: 2026-06-17

Description

Processing malformed SOAP messages when performing the HNAP Login action causes a buffer overflow in the stack in some D-Link DIR routers. The vulnerable XML fields within the SOAP body are: Action, Username, LoginPassword, and Captcha. The following products are affected: DIR-823, DIR-822, DIR-818L(W), DIR-895L, DIR-890L, DIR-885L, DIR-880L, DIR-868L, and DIR-850L.

Frequently asked questions

What is CVE-2016-6563?: Processing malformed SOAP messages when performing the HNAP Login action causes a buffer overflow in the stack in some D-Link DIR routers. The vulnerable XML fields within the SOAP body are: Action, Username, LoginPassword, and Captcha. The following products are affected: DIR-823, DIR-822, DIR-818L(W), DIR-895L, DIR-890L, DIR-885L, DIR-880L, DIR-868L, and DIR-850L.
How severe is CVE-2016-6563?: CVE-2016-6563 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-2016-6563 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 80% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-6563?: CVE-2016-6563 primarily affects Dlink Dir-823 Firmware. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-6563?: 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-2016-6563 published?: CVE-2016-6563 was published on 2018-07-13 and last updated on 2026-06-17.

References

Affected products (9)

cpe:2.3:o:dlink:dir-823_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dir-822_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dir-818l\(w\)_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dir-895l_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dir-890l_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dir-885l_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dir-880l_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dir-868l_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:dlink:dir-850l_firmware:-:*:*:*:*:*:*:*

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