7.5

CVE-2020-7663: canonical ubuntu_linux

Modified
AliasesSUSE-SU-2023:0127-1UBUNTU-CVE-2020-7663USN-4502-1
Published 02-06-2020Last modified 04-08-2024

Vulnerability summary

CVE-2020-7663 is a high (CVSS 7.5) vulnerability in canonical ubuntu_linux. EPSS estimates a 4.64% chance of exploitation in the next 30 days, higher than 91.7% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Prioritisepublic exploit

Public exploit (reference, Date unknown)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
4.64%
0%100%
Low · +0.11 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 1
RHSA-2020:4366

Timeline

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

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.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

4.64%

Chance of exploitation in the next 30 days

Percentile

92%

Versus all other CVEs

30-day change

Increase +0.11 pp

From 4.53% 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

1 found
  • 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.

Suse4 products
  • rubygem-websocket-extensions&distro=SUSE Linux Enterprise High Availability Extension 15 SP1< 0.1.3-150000.3.4.1
  • rubygem-websocket-extensions&distro=SUSE Linux Enterprise High Availability Extension 15 SP2< 0.1.3-150000.3.4.1
  • rubygem-websocket-extensions&distro=SUSE Linux Enterprise High Availability Extension 15 SP3< 0.1.3-150000.3.4.1
  • rubygem-websocket-extensions&distro=SUSE Linux Enterprise High Availability Extension 15 SP4< 0.1.3-150000.3.4.1
Opensuse3 products
  • ruby3.2-rubygem-websocket-extensions&distro=openSUSE Tumbleweed< 0.1.5-1.16
  • rubygem-websocket-extensions&distro=openSUSE Leap 15.4< 0.1.3-150000.3.4.1
  • rubygem-websocket-extensions&distro=openSUSE Tumbleweed< 0.1.5-1.20 | < 0.1.5-1.22 | < 0.1.5-1.24
Debian2 products
  • ruby-websocket-extensions< 0.1.2-1+deb9u1 | < 0.1.5-1
  • debian_linuxEOL9.0
Canonical1 product
RubyGems1 product
  • websocket-extensions< 0.1.5
Ubuntu1 product
  • ruby-websocket-extensions< 0.1.2-1+deb9u1build0.16.04.1 | < 0.1.2-1+deb9u1build0.18.04.1 | < 0.1.2-1+deb9u1build0.20.04.1
Websocket-extensions_project1 product

7 vendors · 13 products

References

18 links
Show all 18 references