CVE-2021-3401

Q: How do I fix CVE-2021-3401?

Upgrade bitcoin to 0.19.0 or later.

Q: Is CVE-2021-3401 being actively exploited?

Not that we know of. CVE-2021-3401 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 10.5% is the estimated probability that it will be exploited in the next 30 days. That is higher than 95% of all scored CVEs.

Q: How severe is CVE-2021-3401?

CVE-2021-3401 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2021-3401 affect?

Published advisories record a fix for bitcoin (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

CRITICALEPSS 95th pctl

9.8

CVSS v3

NVD

Description

Bitcoin Core before 0.19.0 might allow remote attackers to execute arbitrary code when another application unsafely passes the -platformpluginpath argument to the bitcoin-qt program, as demonstrated by an x-scheme-handler/bitcoin handler for a .desktop file or a web browser. NOTE: the discoverer states "I believe that this vulnerability cannot actually be exploited."

CWE-88

How to fix

Remediation Available

bitcoinNVD

Affected:< 0.19.0Fixed in:0.19.0CVE-2021-3401derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

10.48%probability of exploitation in 30 days

95thpercentile

Very high risk: more likely to be exploited than 95% of all known CVEs.

References

Patch1

github.com

Third-Party Advisory1

achow101.com

Related Vulnerabilities

Other CWE-88 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2016-10033	Critical	9.8	100%	KEV	Fix
CVE-2022-36804	High	8.8	99%	KEV	Fix
CVE-2026-24061	Critical	9.8	98%	KEV	Fix
CVE-2007-0882	High	10.0	98%	-	-
CVE-2018-17456	Critical	9.8	97%	-	Fix
CVE-2018-19518	High	7.5	95%	-	Fix

Common questions

How do I fix CVE-2021-3401?

Upgrade bitcoin to 0.19.0 or later.

Is CVE-2021-3401 being actively exploited?

Not that we know of. CVE-2021-3401 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 10.5% is the estimated probability that it will be exploited in the next 30 days. That is higher than 95% of all scored CVEs.

How severe is CVE-2021-3401?

CVE-2021-3401 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2021-3401 affect?

Published advisories record a fix for bitcoin (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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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 2024-11-21.