CVE-2018-1000518

Name: CVE-2018-1000518
Creator: NVD / NIST
Published: 2018-06-26T16:29:01.243+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.82%

Last modified Jun 17, 2026

CVE-2018-1000518 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. aaugustin websockets version 4 contains a CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in Servers and clients, unless configured with compression=None that can result in Denial of Service by memory exhaustion. This attack appear to be exploitable via Sending a specially crafted frame on an established connection. EPSS estimates a 1.82% chance of exploitation in the next 30 days.

Description

aaugustin websockets version 4 contains a CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in Servers and clients, unless configured with compression=None that can result in Denial of Service by memory exhaustion. This attack appear to be exploitable via Sending a specially crafted frame on an established connection. This vulnerability appears to have been fixed in 5.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.82%

76.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Websockets Project	Websockets	4.0

References

https://github.com/aaugustin/websockets/pull/407Exploit, Patch, Third Party Advisory
https://github.com/aaugustin/websockets/pull/407Exploit, Patch, Third Party Advisory

Timeline

Published: Jun 26, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-1000518?

How severe is CVE-2018-1000518?

CVE-2018-1000518 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.82% probability of exploitation in the next 30 days.

How do I fix CVE-2018-1000518?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-1000518?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST