CVE-2020-27223: apache nifi Inefficient Algorithmic Complexity
Vulnerability summary
CVE-2020-27223 is a medium (CVSS 5.3) Inefficient Algorithmic Complexity vulnerability in apache nifi. EPSS estimates a 78.03% chance of exploitation in the next 30 days, higher than 99.5% of scored vulnerabilities.
Not severe (CVSS 5.2, adjacent network); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 4Timeline
- 26-02-2021PublishedVulnerability first disclosed.
- 20-08-2025Last modifiedVulnerability information updated.
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.
CVSS metrics
6 scores · 5 sources · 2 versions- CVE.orgCNA5.2MediumCVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- OSV · DebianEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- OSV · MavenEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS trend
Probability
78.03%
Chance of exploitation in the next 30 days
Percentile
100%
Versus all other CVEs
30-day change
Increase +0.08 pp
From 77.95% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-407Inefficient Algorithmic ComplexityAn algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.
- CWE-400Uncontrolled Resource ConsumptionThe product does not properly control the allocation and maintenance of a limited resource.
Affected systems
Known conditions: adjacent network, low-privilege account, user interaction (CVSS vector). Other conditions: not stated in public data.
Netapp10 products
- e-series_santricity_os_controller≥ 11.0.0, ≤ 11.70.1
- e-series_santricity_web_servicesna
- element_plug-in_for_vcenter_serverna
- hcina
- hci_management_nodena
Debian2 products
- jetty9< 9.4.38-1
- debian_linuxEOL10.0
Eclipse1 product
- jettyEOL≥ 9.4.7, < 9.4.36 | 9.4.6:20170531 | 9.4.6:20180619 | 9.4.36 | 9.4.36:20210114 | 10.0.0 | 11.0.0
Oracle1 product
- rest_data_services< 20.4.3.050.1904
Org.eclipse.jetty1 product
- jetty-server≥ 9.4.6, < 9.4.37 | ≥ 10.0.0, < 10.0.1 | ≥ 11.0.0, < 11.0.1
Suse1 product
- jetty-minimal&distro=SUSE Linux Enterprise Module for Development Tools 15 SP2< 9.4.38-3.6.2
The eclipse foundation1 product
- eclipse jetty≥ 9.4.6.v20170531, < unspecified | ≥ unspecified, ≤ 9.4.36.v20210114 | 10.0.0 | 11.0.0
Ubuntu1 product
- jetty9All versions (No fix recorded)
9 vendors · 21 products
References
136 links- github.com/eclipse/jetty.project/security/advisories/GHSA-m394-8rww-3jr7X Refsource CONFIRMREPORTWEBThird Party Advisory
Show all 100 references
- lists.apache.org/thread.html/…X Refsource MISC
- lists.apache.org/thread.html/…X Refsource MISC
Showing 100 of 136.