HIGH
CVE-2020-27813
CWE-190Published: December 2, 2020· Updated: Jun 17, 2026
7.5
CVSS v3.1
Official Description
An integer overflow vulnerability exists with the length of websocket frames received via a websocket connection. An attacker would use this flaw to cause a denial of service attack on an HTTP Server allowing websocket connections.
Technical Analysis
CVE-2020-27813 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Vendors & Products
Debian1 product(s)
debian linux
gorillatoolkit1 product(s)
websocket
Source: NVD CPE · 2 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (8)
→
https://bugzilla.redhat.com/show_bug.cgi?id=1902111Issue Tracking · Third Party Advisory
→
https://github.com/gorilla/websocket/security/advisories/GHSA-jf24-p9p9-4rjhThird Party Advisory
→
https://lists.debian.org/debian-lts-announce/2021/01/msg00008.htmlMailing List · Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=1902111Issue Tracking · Third Party Advisory
→
https://github.com/gorilla/websocket/security/advisories/GHSA-jf24-p9p9-4rjhThird Party Advisory
→
https://lists.debian.org/debian-lts-announce/2021/01/msg00008.htmlMailing List · Third Party Advisory
Quick Facts
CVE IDCVE-2020-27813
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-190
CISA KEVNo
Affected2 vendor(s)
PublishedDec 2, 2020
Related CVEs (CWE-190)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2020-27813 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.