How severe is CVE-2020-25366?

CVE-2020-25366 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2020-25366 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-25366?

CVE-2020-25366 affects Dlink Dir-823g Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-25366?

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-2020-25366 published?

CVE-2020-25366 was published on 2021-11-04 and last updated on 2026-07-05.

CVE-2020-25366

CVE-2020-25366 is a critical-severity vulnerability in Dlink Dir-823g Firmware with a CVSS 3.x base score of 9.1. 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-862.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v2: 8.5
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-862
Affected product: Dlink Dir-823g Firmware
Published: 2021-11-04
Last modified: 2026-07-05

Description

An issue in the component /cgi-bin/upload_firmware.cgi of D-Link DIR-823G REVA1 1.02B05 allows attackers to cause a denial of service (DoS) via unspecified vectors.

Frequently asked questions

What is CVE-2020-25366?: An issue in the component /cgi-bin/upload_firmware.cgi of D-Link DIR-823G REVA1 1.02B05 allows attackers to cause a denial of service (DoS) via unspecified vectors.
How severe is CVE-2020-25366?: CVE-2020-25366 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2020-25366 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-25366?: CVE-2020-25366 affects Dlink Dir-823g Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-25366?: 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-2020-25366 published?: CVE-2020-25366 was published on 2021-11-04 and last updated on 2026-07-05.

References

Affected products (1)

cpe:2.3:o:dlink:dir-823g_firmware:1.02b05:*:*:*:*:*:*:*

More vulnerabilities in Dlink Dir-823g Firmware

CVE-2023-43241 — Critical (CVSS 9.8): D-Link DIR-823G v1.0.2B05 was discovered to contain a stack overflow via parameter TXPower and GuardInt in…
CVE-2023-43235 — Critical (CVSS 9.8): D-Link DIR-823G v1.0.2B05 was discovered to contain a stack overflow via parameter StartTime and EndTime in…
CVE-2023-26616 — Critical (CVSS 9.8): D-Link DIR-823G firmware version 1.02B05 has a buffer overflow vulnerability, which originates from the URL field in…
CVE-2023-26613 — Critical (CVSS 9.8): An OS command injection vulnerability in D-Link DIR-823G firmware version 1.02B05 allows unauthorized attackers to…
CVE-2023-26612 — Critical (CVSS 9.8): D-Link DIR-823G firmware version 1.02B05 has a buffer overflow vulnerability, which originates from the HostName field…
CVE-2023-29665 — Critical (CVSS 9.8): D-Link DIR823G_V1.0.2B05 was discovered to contain a stack overflow via the NewPassword parameters in SetPasswdSettings.

All CVEs affecting Dlink Dir-823g Firmware →

Other CWE-862 (Missing Authorization) vulnerabilities

CVE-2026-0092 — Critical (CVSS 10.0): In Package Manager, there is a possible device lock controller bypass due to a missing permission check. This could…
CVE-2026-33712 — Critical (CVSS 10.0): Typebot is a chatbot builder tool. In versions 3.15.2 and prior, the preview chat endpoint (POST…
CVE-2026-2031 — Critical (CVSS 10.0): An Improper Access Control vulnerability in several internal API endpoints for Google Cloud Application Integration…
CVE-2026-34976 — Critical (CVSS 10.0): Dgraph is an open source distributed GraphQL database. Prior to 25.3.1, the restoreTenant admin mutation is missing…
CVE-2025-30416 — Critical (CVSS 10.0): Sensitive data disclosure and manipulation due to missing authorization. The following products are affected: Acronis…
CVE-2025-45854 — Critical (CVSS 10.0): /server/executeExec of JEHC-BPM 2.0.1 allows attackers to execute arbitrary code via execParams.

Browse all CWE-862 (Missing Authorization) vulnerabilities →