CVE & CISA-KEV Catalog

CVE-2020-27223

MEDIUMEPSS 100th pctl
5.2
CVSS v3
NVD

Description

In Eclipse Jetty 9.4.6.v20170531 to 9.4.36.v20210114 (inclusive), 10.0.0, and 11.0.0 when Jetty handles a request containing multiple Accept headers with a large number of “quality” (i.e. q) parameters, the server may enter a denial of service (DoS) state due to high CPU usage processing those quality values, resulting in minutes of CPU time exhausted processing those quality values.

CWE-407CWE-400Resource Exhaustion

How to fix

Remediation Available
jetty9Debian
Fixed in:9.4.38-1CVE-2020-27223
Fixed in:9.4.38-1CVE-2020-27223
Fixed in:9.4.38-1CVE-2020-27223
Fixed in:9.4.38-1CVE-2020-27223

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorAdjacent
Attack ComplexityLow
Privileges RequiredLow
User InteractionRequired
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityNone
AvailabilityHigh

CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

Exploit Intelligence

77.95%probability of exploitation in 30 days
100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

References

Vendor Advisory1
Third-Party Advisory1

Related Vulnerabilities

Other CWE-407 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2022-36021Medium5.560%-Fix
CVE-2021-33582High7.53.1%-Fix
CVE-2024-43485High7.53.1%-Fix
CVE-2024-43484High7.52.9%-Fix
CVE-2016-10396High7.52.9%--
CVE-2024-43483High7.52.9%-Fix

Common questions

How do I fix CVE-2020-27223?

Upgrade jetty9 on debian 11 to 9.4.38-1 or later.

Is CVE-2020-27223 being actively exploited?

Not that we know of. CVE-2020-27223 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 78.0% is the estimated probability that it will be exploited in the next 30 days. That is higher than 100% of all scored CVEs.

How severe is CVE-2020-27223?

CVE-2020-27223 has a CVSS v3 base score of 5.2, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2020-27223 affect?

Published advisories record a fix for jetty9 (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-08-20.