CVE-2021-326405.3MediumCWE-400

CVE-2021-32640: ReDoS in Sec-Websocket-Protocol header

websockets · ws

Affected: websockets ws · Exploitation: possible (1 to 10%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

2.8%probability of exploitation in the next 30 days

86th percentile

050100

Higher than 86% of scored CVEs

5.3MediumCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

ws is an open source WebSocket client and server library for Node.js. A specially crafted value of the `Sec-Websocket-Protocol` header can be used to significantly slow down a ws server. The vulnerability has been fixed in ws@7.4.6 (https://github.com/websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ff). In vulnerable versions of ws, the issue can be mitigated by reducing the maximum allowed length of the request headers using the [`--max-http-header-size=size`](https://nodejs.org/api/cli.html#cli_max_http_header_size_size) and/or the [`maxHeaderSize`](https://nodejs.org/api/http.html#http_http_createserver_options_requestlistener) options.

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

websockets · ws>= 5.0.0 <= 7.4.5

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Possible (1 to 10%). EPSS between 1% and 10%.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Uncontrolled Resource Consumption · Denial of Service
Vendor: websockets
Published: May 2021
Band: Possible (1 to 10%), May 2021
Bounty reports: 1 disclosed on HackerOne

Disclosed bug bounty reports about CVE-2021-32640

The reports on HackerOne that name this CVE, with HackerOne's own outcome. Titles and metadata only.

Regular Expression Denial of Service vulnerabilityReddit · 2022 · medium severityInformative

CoverageNo articles yet

No CyberSIXT article names CVE-2021-32640 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.