How severe is CVE-2018-20587?

CVE-2018-20587 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2018-20587 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-20587?

CVE-2018-20587 primarily affects Bitcoin Bitcoin Core. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-20587?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-20587 published?

CVE-2018-20587 was published on 2019-02-11 and last updated on 2026-06-17.

CVE-2018-20587

CVE-2018-20587 is a medium-severity vulnerability in Bitcoin Bitcoin Core with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 2.1
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Bitcoin Bitcoin Core
Published: 2019-02-11
Last modified: 2026-06-17

Description

Bitcoin Core 0.12.0 through 0.17.1 and Bitcoin Knots 0.12.0 through 0.17.x before 0.17.1.knots20181229 have Incorrect Access Control. Local users can exploit this to steal currency by binding the RPC IPv4 localhost port, and forwarding requests to the IPv6 localhost port.

Frequently asked questions

What is CVE-2018-20587?: Bitcoin Core 0.12.0 through 0.17.1 and Bitcoin Knots 0.12.0 through 0.17.x before 0.17.1.knots20181229 have Incorrect Access Control. Local users can exploit this to steal currency by binding the RPC IPv4 localhost port, and forwarding requests to the IPv6 localhost port.
How severe is CVE-2018-20587?: CVE-2018-20587 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2018-20587 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-20587?: CVE-2018-20587 primarily affects Bitcoin Bitcoin Core. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-20587?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-20587 published?: CVE-2018-20587 was published on 2019-02-11 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:bitcoin:bitcoin_core:*:*:*:*:*:*:*:*
cpe:2.3:a:bitcoinknots:bitcoin_knots:*:*:*:*:*:*:*:*

More vulnerabilities in Bitcoin Bitcoin Core

CVE-2013-2292 — High (CVSS 7.8): bitcoind and Bitcoin-Qt 0.8.0 and earlier allow remote attackers to cause a denial of service (electricity consumption)…
CVE-2012-4684 — High (CVSS 7.8): The alert functionality in bitcoind and Bitcoin-Qt before 0.7.0 supports different character representations of the…
CVE-2025-46597 — High (CVSS 7.5): Bitcoin Core 0.13.0 through 29.x has an integer overflow.
CVE-2025-54605 — High (CVSS 7.5): Bitcoin Core through 29.0 allows Uncontrolled Resource Consumption (issue 2 of 2).
CVE-2025-54604 — High (CVSS 7.5): Bitcoin Core through 29.0 allows Uncontrolled Resource Consumption (issue 1 of 2).
CVE-2024-52920 — High (CVSS 7.5): Bitcoin Core before 0.20.0 allows remote attackers to cause a denial of service (infinite loop) via a malformed GETDATA…

All CVEs affecting Bitcoin Bitcoin Core →