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CVE-2020-7663

HIGHCVSS 7.5/10EPSS 4.35%

Last modified

CVE-2020-7663 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. websocket-extensions ruby module prior to 0.1.5 allows Denial of Service (DoS) via Regex Backtracking. The extension parser may take quadratic time when parsing a header containing an unclosed string parameter value whose content is a repeating two-byte sequence of a backslash and some other character. EPSS estimates a 4.35% chance of exploitation in the next 30 days.

Description

websocket-extensions ruby module prior to 0.1.5 allows Denial of Service (DoS) via Regex Backtracking. The extension parser may take quadratic time when parsing a header containing an unclosed string parameter value whose content is a repeating two-byte sequence of a backslash and some other character. This could be abused by an attacker to conduct Regex Denial Of Service (ReDoS) on a single-threaded server by providing a malicious payload with the Sec-WebSocket-Extensions header.

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
4.35%

90.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersions
Websocket-Extensions ProjectWebsocket-Extensions< 0.1.5
DebianDebian Linux9.0
CanonicalUbuntu Linux16.04
CanonicalUbuntu Linux18.04
CanonicalUbuntu Linux20.04

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-7663?
websocket-extensions ruby module prior to 0.1.5 allows Denial of Service (DoS) via Regex Backtracking. The extension parser may take quadratic time when parsing a header containing an unclosed string parameter value whose content is a repeating two-byte sequence of a backslash and some other character. This could be abused by an attacker to conduct Regex Denial Of Service (ReDoS) on a single-threaded server by providing a malicious payload with the Sec-WebSocket-Extensions header.
How severe is CVE-2020-7663?
CVE-2020-7663 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 4.35% probability of exploitation in the next 30 days.
How do I fix CVE-2020-7663?
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-2020-7663?

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

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Source: NVD / NIST