7.5

CVE-2020-7662: websocket-extensions_project websocket-extensions

Modified
AliasesGHSA-g78m-2chm-r7qvSNYK-JS-WEBSOCKETEXTENSIONS-570623
Published 02-06-2020Last modified 04-08-2024

Vulnerability summary

CVE-2020-7662 is a high (CVSS 7.5) vulnerability in websocket-extensions_project websocket-extensions. EPSS estimates a 3.09% chance of exploitation in the next 30 days, higher than 87.7% of scored vulnerabilities. 3 public exploits are recorded.

Priority
Prioritisepublic exploit

Public exploit (GitHub, Date unknown)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
3.09%
0%100%
Low · +0.08 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits3github, reference

Advisory lineage

Upstream 0 · Downstream 2
RHSA-2020:2796RHSA-2020:2861

Timeline

  1. 02-06-2020
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

websocket-extensions npm module prior to 0.1.4 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.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

3.09%

Chance of exploitation in the next 30 days

Percentile

88%

Versus all other CVEs

30-day change

Increase +0.08 pp

From 3.01% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

3 found
  • githubUnverified

    Websocket Extensions Node

    Maturity: poc

  • referenceUnverified

    Exploit Reference (blog.jcoglan.com)

    Maturity: unknown

  • referenceUnverified

    Exploit Reference (snyk.io)

    Maturity: unknown

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Npm1 product
  • websocket-extensions< 0.1.4
Websocket-extensions_project1 product

2 vendors · 2 products

References

6 links