How severe is CVE-2021-28165?

CVE-2021-28165 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-28165 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 54% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28165?

CVE-2021-28165 primarily affects Eclipse Jetty. In total, 22 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-28165?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-28165 published?

CVE-2021-28165 was published on 2021-04-01 and last updated on 2026-06-17.

CVE-2021-28165

CVE-2021-28165 is a high-severity vulnerability in Eclipse Jetty with a CVSS 3.x base score of 7.5. Its EPSS exploit-prediction score of 54% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.8
EPSS exploit prediction: 54% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Eclipse Jetty
Published: 2021-04-01
Last modified: 2026-06-17

Description

In Eclipse Jetty 7.2.2 to 9.4.38, 10.0.0.alpha0 to 10.0.1, and 11.0.0.alpha0 to 11.0.1, CPU usage can reach 100% upon receiving a large invalid TLS frame.

Frequently asked questions

What is CVE-2021-28165?: In Eclipse Jetty 7.2.2 to 9.4.38, 10.0.0.alpha0 to 10.0.1, and 11.0.0.alpha0 to 11.0.1, CPU usage can reach 100% upon receiving a large invalid TLS frame.
How severe is CVE-2021-28165?: CVE-2021-28165 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-28165 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 54% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28165?: CVE-2021-28165 primarily affects Eclipse Jetty. In total, 22 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-28165?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-28165 published?: CVE-2021-28165 was published on 2021-04-01 and last updated on 2026-06-17.

References

Affected products (22)

cpe:2.3:a:eclipse:jetty:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:autovue_for_agile_product_lifecycle_management:21.0.2:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_policy:1.14.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_element_manager:8.2.2:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_services_gatekeeper:7.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_session_report_manager:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:communications_session_route_manager:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:rest_data_services:*:*:*:*:*:*:*:*
cpe:2.3:a:oracle:siebel_core_-_automation:*:*:*:*:*:*:*:*
cpe:2.3:a:jenkins:jenkins:*:*:*:*:lts:*:*:*
cpe:2.3:a:jenkins:jenkins:*:*:*:*:*:*:*:*
cpe:2.3:a:netapp:cloud_manager:*:*:*:*:*:*:*:*
cpe:2.3:a:netapp:e-series_performance_analyzer:*:*:*:*:*:*:*:*
cpe:2.3:a:netapp:e-series_santricity_os_controller:*:*:*:*:*:*:*:*
cpe:2.3:a:netapp:e-series_santricity_storage:*:*:*:*:*:vcenter:*:*
cpe:2.3:a:netapp:e-series_santricity_web_services:*:*:*:*:*:web_services_proxy:*:*
cpe:2.3:a:netapp:ontap_tools:*:*:*:*:*:vmware_vsphere:*:*
cpe:2.3:a:netapp:santricity_cloud_connector:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:santricity_web_services_proxy:*:*:*:*:*:*:*:*
cpe:2.3:a:netapp:snapcenter:*:*:*:*:*:*:*:*
cpe:2.3:a:netapp:storage_replication_adapter_for_clustered_data_ontap:*:*:*:*:*:vmware_vsphere:*:*
cpe:2.3:a:netapp:vasa_provider_for_clustered_data_ontap:*:*:*:*:*:*:*:*

More vulnerabilities in Eclipse Jetty

CVE-2017-7658 — Critical (CVSS 9.8): In Eclipse Jetty Server, versions 9.2.x and older, 9.3.x (all non HTTP/1.x configurations), and 9.4.x (all HTTP/1.x…
CVE-2017-7657 — Critical (CVSS 9.8): In Eclipse Jetty, versions 9.2.x and older, 9.3.x (all configurations), and 9.4.x (non-default configuration with…
CVE-2016-4800 — Critical (CVSS 9.8): The path normalization mechanism in PathResource class in Eclipse Jetty 9.3.x before 9.3.9 on Windows allows remote…
CVE-2019-17638 — Critical (CVSS 9.4): In Eclipse Jetty, versions 9.4.27.v20200227 to 9.4.29.v20200521, in case of too large response headers, Jetty throws an…
CVE-2018-12538 — High (CVSS 8.8): In Eclipse Jetty versions 9.4.0 through 9.4.8, when using the optional Jetty provided FileSessionDataStore for…
CVE-2026-1605 — High (CVSS 7.5): In Eclipse Jetty, versions 12.0.0-12.0.31 and 12.1.0-12.0.5, class GzipHandler exposes a vulnerability when a…

All CVEs affecting Eclipse Jetty →

Other CWE-400 (Uncontrolled Resource Consumption) vulnerabilities

CVE-2026-46775 — Critical (CVSS 9.9): Vulnerability in Oracle REST Data Services (component: Core). Supported versions that are affected are 24.2.0-26.1.0.…
CVE-2025-61303 — Critical (CVSS 9.8): Hatching Triage Sandbox Windows 10 build 2004 (2025-08-14) and Windows 10 LTSC 2021(2025-08-14) contains a…
CVE-2025-43193 — Critical (CVSS 9.8): The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.6, macOS Sonoma 14.7.7,…
CVE-2025-24269 — Critical (CVSS 9.8): The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.4. An app may be able to…
CVE-2025-24264 — Critical (CVSS 9.8): The issue was addressed with improved memory handling. This issue is fixed in Safari 18.4, iOS 18.4 and iPadOS 18.4,…
CVE-2025-24260 — Critical (CVSS 9.8): The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.4, macOS Sonoma 14.7.5,…

Browse all CWE-400 (Uncontrolled Resource Consumption) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

62.201.228.210 (ipv4-addr)
195.158.26.59 (ipv4-addr)
175.100.107.238 (ipv4-addr)
103.147.248.44 (ipv4-addr)
39.104.63.170 (ipv4-addr)
84.54.115.46 (ipv4-addr)
195.158.14.232 (ipv4-addr)
115.241.228.34 (ipv4-addr)