What is CVE-2017-18350?

CVE-2017-18350 is a medium-severity vulnerability in Bitcoin Core, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.9/10. Published 2020-03-12.

How severe is CVE-2017-18350?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Is CVE-2017-18350 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Bitcoin Core

CVE-2017-18350

bitcoind and Bitcoin-Qt prior to 0.15.1 have a stack-based buffer overflow if an attacker-controlled SOCKS proxy server is used. This results from an integer signedness error when the proxy server responds with an acknowledgement of an unexpected target domain name.

Vulnerability class: Buffer Overflow

Published 2020-03-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.013 (69.8th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 69.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Bitcoin Core

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2017-18350?: CVE-2017-18350 is a medium-severity vulnerability in Bitcoin Core, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.9/10. Published 2020-03-12.
How severe is CVE-2017-18350?: Medium severity. CVSS v3 base score is 5.9 out of 10.
Is CVE-2017-18350 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.