How severe is CVE-2023-36089?

CVE-2023-36089 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-2023-36089 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-36089?

CVE-2023-36089 affects Dlink Dir-645 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-36089?

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-2023-36089 published?

CVE-2023-36089 was published on 2023-07-31 and last updated on 2026-06-17.

CVE-2023-36089

CVE-2023-36089 is a critical-severity vulnerability in Dlink Dir-645 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-863.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (58th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-863
Affected product: Dlink Dir-645 Firmware
Published: 2023-07-31
Last modified: 2026-06-17

Description

Authentication Bypass vulnerability in D-Link DIR-645 firmware version 1.03 allows remote attackers to gain escalated privileges via function phpcgi_main in cgibin. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

Frequently asked questions

What is CVE-2023-36089?: Authentication Bypass vulnerability in D-Link DIR-645 firmware version 1.03 allows remote attackers to gain escalated privileges via function phpcgi_main in cgibin. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.
How severe is CVE-2023-36089?: CVE-2023-36089 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-2023-36089 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-36089?: CVE-2023-36089 affects Dlink Dir-645 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-36089?: 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-2023-36089 published?: CVE-2023-36089 was published on 2023-07-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:dlink:dir-645_firmware:1.03:*:*:*:*:*:*:*

More vulnerabilities in Dlink Dir-645 Firmware

CVE-2015-2052 — Critical (CVSS 10.0): Stack-based buffer overflow in the DIR-645 Wired/Wireless Router Rev. Ax with firmware 1.04b12 and earlier allows…
CVE-2018-25115 — Critical (CVSS 9.8): Multiple D-Link DIR-series routers, including DIR-110, DIR-412, DIR-600, DIR-610, DIR-615, DIR-645, and DIR-815…
CVE-2022-46475 — Critical (CVSS 9.8): D-Link DIR 645A1 1.06B01_Beta01 was discovered to contain a stack overflow via the service= variable in the…
CVE-2022-32092 — Critical (CVSS 9.8): D-Link DIR-645 v1.03 was discovered to contain a command injection vulnerability via the QUERY_STRING parameter at…
CVE-2021-43722 — Critical (CVSS 9.8): D-Link DIR-645 1.03 A1 is vulnerable to Buffer Overflow. The hnap_main function in the cgibin handler uses sprintf to…
CVE-2013-7471 — Critical (CVSS 9.8): An issue was discovered in soap.cgi?service=WANIPConn1 on D-Link DIR-845 before v1.02b03, DIR-600 before v2.17b01,…

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