CVE-2020-36517

Exp

An information leak in Nabu Casa Home Assistant Operating System and Home Assistant Supervised 2022.03 allows a DNS operator to gain knowledge about internal network resources via the hardcoded DNS resolver configuration.

Published: 2022-03-10 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-36517 is rated High Exploit Risk (75.7/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.85%). 11 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.01% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2020-36517

EDB-ID Source Kind Published Link
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Exploit prediction scoring system (EPSS) score for CVE-2020-36517

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.85% 2.85% +1.01%
2 2025-11-21 1.50% 1.85% +0.35%
3 2025-11-18 — 1.50% —

Full EPSS history (17 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-36517

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2020-36517

Affected software / configurations for CVE-2020-36517

Vendor Product Version Raw CPE
home-assistant home-assistant 2022.03 cpe:2.3:a:home-assistant:home-assistant:2022.03:*:*:*:*:*:*:*

References for CVE-2020-36517

URL Tags
https://community.home-assistant.io/t/ha-os-dns-setting-configuration-not-respected/356572 Exploit Issue Tracking Vendor Advisory
https://github.com/home-assistant/plugin-dns/issues/17 Third Party Advisory
https://github.com/home-assistant/plugin-dns/issues/20 Exploit Issue Tracking Third Party Advisory
https://github.com/home-assistant/plugin-dns/issues/22 Issue Tracking Third Party Advisory
https://github.com/home-assistant/plugin-dns/issues/50 Exploit Issue Tracking Third Party Advisory
https://github.com/home-assistant/plugin-dns/issues/51 Exploit Issue Tracking Third Party Advisory
https://github.com/home-assistant/plugin-dns/issues/53 Exploit Third Party Advisory
https://github.com/home-assistant/plugin-dns/issues/54 Exploit Third Party Advisory
https://github.com/home-assistant/plugin-dns/issues/6 Exploit Third Party Advisory
https://github.com/home-assistant/plugin-dns/issues/64 Exploit Third Party Advisory
https://github.com/home-assistant/plugin-dns/issues/70 Exploit Third Party Advisory
https://github.com/home-assistant/plugin-dns/pull/55 Exploit Patch Third Party Advisory
https://github.com/home-assistant/plugin-dns/pull/56 Exploit Issue Tracking Third Party Advisory
https://github.com/home-assistant/plugin-dns/pull/58 Patch Third Party Advisory
https://github.com/home-assistant/plugin-dns/pull/59 Issue Tracking Patch Third Party Advisory
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