Is CVE-2025-65821 in the CISA KEV catalog?

No. CVE-2025-65821 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-65821?

CVE-2025-65821 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2025-65821?

CVE-2025-65821 has an EPSS score of 0.32% (24th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2025-65821?

No published fix for CVE-2025-65821 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2025-65821

HIGH

7.5

CVSS v3

NVD

Description

As UART download mode is still enabled on the ESP32 chip on which the firmware runs, an adversary can dump the flash from the device and retrieve sensitive information such as details about the current and previous Wi-Fi network from the NVS partition. Additionally, this allows the adversary to reflash the device with their own firmware which may contain malicious modifications.

CWE-1191

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploit Intelligence

0.32%probability of exploitation in 30 days

24thpercentile

Low risk: more likely to be exploited than 24% of all known CVEs.

References

Third-Party Advisory2

Related Vulnerabilities

Other CWE-1191 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-4231	Medium	4.6	0.6%	-	-
CVE-2022-43096	Medium	6.8	0.5%	-	Fix
CVE-2020-9285	Medium	6.8	0.5%	-	-
CVE-2025-26409	Medium	6.8	0.3%	-	-
CVE-2025-26408	Medium	6.1	0.3%	-	-
CVE-2024-41692	Unscored	-	0.3%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-01-21.