`CVE-2021-35559` Oracle Java SE

Affected software	Oracle Java SE
Affected versions	Java SE: 7u311, 8u301, 11.0.12, 17; Oracle GraalVM Enterprise Edition: 20.3.3, 21.2.0
Severity	5.3 Medium CVSS 3.1 3 scores
Fixed in	Oracle Critical Patch Update October 2021
Weakness	Uncontrolled resource consumption (CWE-400)
Published	20 Oct 2021
Updated	17 Jun 2026

Description

Vulnerability in the Java SE, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Swing). Supported versions that are affected are Java SE: 7u311, 8u301, 11.0.12, 17; Oracle GraalVM Enterprise Edition: 20.3.3 and 21.2.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Java SE, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Java SE, Oracle GraalVM Enterprise Edition. Note: This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability can also be exploited by using APIs in the specified Component, e.g., through a web service which supplies data to the APIs. CVSS 3.1 Base Score 5.3 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

Exploitation status

Proof of concept only

A proof of concept exists, but no reviewed exploit catalogue lists this CVE.

CISA KEV not listed
VulnCheck KEV not listed
CISA Vulnrichment exploitation: poc CISA recorded that an exploit has been demonstrated. Automatable: yes, technical impact: partial.
Indexed PoC none indexed
EPSS 16% chance in 30 days A model's forecast, not a report of exploitation. Higher than 97% of all scored CVEs.

Waratek protection

Protected by Waratek

Waratek has a rule that blocks attacks on this vulnerability.

Protection full
Action available patch rule
Review human ARMR file
Record active

Decided by	An ARMR patch file on disk for this CVE
Finding	CVE has an ARMR patch rule that provides mitigation

Decided by

An ARMR patch file on disk for this CVE

Finding

CVE has an ARMR patch rule that provides mitigation

ARMR rule files

1 file

The rule files Waratek ships for this CVE. Some CVEs need more than one, for example one per affected library or one per ARMR version.

CVE-2021-35559.armr patch rule, ARMR 2.6 added 2021-11-11 updated 2026-03-04

How to mitigate CVE-2021-35559

Apply the fix in Oracle Critical Patch Update October 2021. Until you can, Waratek RASP blocks exploitation with a rule written for this CVE. It runs inside the Java application, with no code changes.

Waratek RASP Runtime protection for Java applications

CVSS

5.3 MEDIUM v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L 3 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

Version Score Band Vector Assigner Type

CVSS 3.1 5.3 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L secalert_us@oracle.com Secondary published

CVSS 3.1 5.3 MEDIUM CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L NVD Secondary

CVSS 2.0 5.0 none AV:N/AC:L/Au:N/C:N/I:N/A:P NVD Primary

Version	Score	Band	Vector	Assigner	Type
CVSS 3.1	5.3	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`	secalert_us@oracle.com	Secondary	published
CVSS 3.1	5.3	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`	NVD	Secondary
CVSS 2.0	5.0	none	`AV:N/AC:L/Au:N/C:N/I:N/A:P`	NVD	Primary

Affected software and releases

Oracle advisories

Advisory	Type	Quarter	Products Oracle names in its risk matrix
Oracle Critical Patch Update October 2021 ↗	CPU	2021-Q4	Oracle Java SE / Swing (Java SE: 7u311, 8u301, 11.0.12, 17; Oracle GraalVM Enterprise Edition: 20.3.3, 21.2.0) Oracle's note: This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability can also be exploited by using APIs in the specified Component, e.g., through a web service which supplies data to the APIs.

Advisory

Type

Quarter

Products Oracle names in its risk matrix

Oracle Critical Patch Update October 2021 ↗

CPU

2021-Q4

Oracle Java SE / Swing (Java SE: 7u311, 8u301, 11.0.12, 17; Oracle GraalVM Enterprise Edition: 20.3.3, 21.2.0)
Oracle's note: This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability can also be exploited by using APIs in the specified Component, e.g., through a web service which supplies data to the APIs.

Oracle components and versions

Family	Component	Versions, as Oracle lists them	Read as
Oracle Java SE	Swing	Java SE: 7u311, 8u301, 11.0.12, 17; Oracle GraalVM Enterprise Edition: 20.3.3, 21.2.0	7.0.311.0 · 8.0.301.0 · 11.0.12.0 · 17.0.0.0 · 20.3.3.0 · 21.2.0.0

Family

Component

Versions, as Oracle lists them

Read as

Oracle Java SE

Swing

Java SE: 7u311, 8u301, 11.0.12, 17; Oracle GraalVM Enterprise Edition: 20.3.3, 21.2.0

7.0.311.0 · 8.0.301.0 · 11.0.12.0 · 17.0.0.0 · 20.3.3.0 · 21.2.0.0

Products and versions

14 products, 22 version entries

Source	Vendor	Product	Scheme	Affected versions
nvd	debian	debian linux	generic	9.0 · 10.0 · 11.0
nvd	fedoraproject	fedora	generic	33 · 34 · 35
nvd	netapp	active iq unified manager	generic	any version
nvd	netapp	e-series santricity os controller	generic	≥ 11.0.0 and ≤ 11.50.2
nvd	netapp	e-series santricity storage manager	generic	any version
nvd	netapp	e-series santricity web services	generic	any version
nvd	netapp	hci management node	generic	any version
nvd	netapp	oncommand insight	generic	any version
nvd	netapp	oncommand workflow automation	generic	any version
nvd	netapp	santricity unified manager	generic	any version
nvd	netapp	snapmanager	generic	any version
nvd	netapp	solidfire	generic	any version
nvd	oracle	graalvm	javase	20.3.3 · 21.2.0
nvd	oracle	openjdk	javase	7:update311 · 8:update301 · 11.0.12 · 17

Source

Vendor

Product

Scheme

Affected versions

nvd

debian

debian linux

generic

9.0 · 10.0 · 11.0

nvd

fedoraproject

fedora

generic

33 · 34 · 35

nvd

netapp

active iq unified manager

generic

any version

nvd

netapp

e-series santricity os controller

generic

≥ 11.0.0 and ≤ 11.50.2

nvd

netapp

e-series santricity storage manager

generic

any version

nvd

netapp

e-series santricity web services

generic

any version

nvd

netapp

hci management node

generic

any version

nvd

netapp

oncommand insight

generic

any version

nvd

netapp

oncommand workflow automation

generic

any version

nvd

netapp

santricity unified manager

generic

any version

nvd

netapp

snapmanager

generic

any version

nvd

netapp

solidfire

generic

any version

nvd

oracle

graalvm

javase

20.3.3 · 21.2.0

nvd

oracle

openjdk

javase

7:update311 · 8:update301 · 11.0.12 · 17

References

URL	Tags
https://access.redhat.com/errata/RHSA-2021:3884	ADVISORY, RHSA-2021:3884
https://access.redhat.com/security/cve/CVE-2021-35559	REPORT, RHSA-2021:3884
https://access.redhat.com/errata/RHSA-2021:3885	ADVISORY, RHSA-2021:3885
https://access.redhat.com/errata/RHSA-2021:3886	ADVISORY, RHSA-2021:3886
https://access.redhat.com/errata/RHSA-2021:3887	ADVISORY, RHSA-2021:3887
https://access.redhat.com/errata/RHSA-2021:3889	ADVISORY, RHSA-2021:3889
https://access.redhat.com/errata/RHSA-2021:3891	ADVISORY, RHSA-2021:3891
https://access.redhat.com/errata/RHSA-2021:3892	ADVISORY, RHSA-2021:3892
https://access.redhat.com/errata/RHSA-2021:3893	ADVISORY, RHSA-2021:3893
https://access.redhat.com/errata/RHSA-2021:4135	ADVISORY, RHSA-2021:4135

URL

Timeline

Published	2021-10-20	By the CVE Program.
ARMR remediation created	2021-11-11	Earliest commit adding this CVE's ARMR patch or security rule.
ARMR remediation last updated	2026-03-04	Most recent commit touching this CVE's ARMR patch or security rule.
Last VRT activity	2026-03-04	Most recent commit touching this CVE's classification, patch or rule file.
NVD record modified	2026-06-17	NVD's own last-modified date for this record.

Published

2021-10-20

By the CVE Program.

ARMR remediation created

2021-11-11

Earliest commit adding this CVE's ARMR patch or security rule.

ARMR remediation last updated

2026-03-04

Most recent commit touching this CVE's ARMR patch or security rule.

Last VRT activity

2026-03-04

Most recent commit touching this CVE's classification, patch or rule file.

NVD record modified

2026-06-17

NVD's own last-modified date for this record.

How VRT decided (2 of 24 rules ran)

2 of 24 rules ran. The rest didn't run because an earlier rule had already settled the CVE.

# Rule Outcome Status Detail

identity: Does this identifier describe a vulnerability at all? the first rule that matches decides

1 rejected no match CVE Program withdrawal of this identifier

scope: Is it a vulnerability Waratek protects? the first rule that matches decides

2 armr-patch-file decided it matched Protected by Waratek ARMR patch file exists for this CVE

3 armr-secure-rule-file not reached An ARMR security-rule template on disk for this CVE

4 manual-classification not reached A researcher's recorded decision for this specific CVE

5 manual classification not reached Manual classification of this CVE in the legacy dataset

6 non-java-upstream not reached A root cause in non-Java code: an OS kernel, a C library, or a bundled runtime

7 oracle-component not reached The defect being in a component of a tracked product the agent does not reach: JavaFX, the Java SE installer, the JInitiator browser plug-in, the native WebLogic proxy plug-in, or a native part of Oracle Application Server or Collaboration Suite (HTTP Server, Web Cache, Internet Directory, mail and calendar servers). Oracle gives these no CPE of their own and names them only in the description.

8 java-client-side not reached Oracle's own risk-matrix note saying the CVE is reached only through untrusted code in the Java sandbox (applets, Web Start) or only through a client installation of Java, so a server running its own trusted code is not exposed

9 osv-maven not reached An OSV.dev record of this CVE affecting a package published to Maven Central. When every such package is one business applications do not use (Minecraft mods and launchers, Fastjson) and no tracked product is named by CPE, it settles the CVE as Outside Waratek scope instead

10 cna-maven-package not reached An affected Maven artifact named by the CNA itself

11 known-cpe-product not reached An NVD CPE naming a product ARMR tracks

12 cna-cpe-product not reached A CPE the CNA published naming a tracked product. Oracle publishes these on advisory day, months before NVD.

13 oracle-advisory-family not reached A tracked product family named in Oracle's own risk matrix. CPE cannot carry a suite name, only a module.

14 cna-named-product not reached A tracked product named in words by the CVE's own CNA, on a record with no CPE yet. Apache and Eclipse publish these on advisory day, before NVD adds CPE data.

15 non-deployable-product not reached The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached

16 unmatched-product not reached No tracked product matched above, and none present at all

disposition: What do we do about one that is? every rule runs

17 patch-hint not reached A reference pointing at the upstream fix: a commit, a PR, a Red Hat bug

18 open-source-maven not reached The affected package being open source on Maven, so the fix can be read

19 poc-derivable not reached An indexed exploit clearing the evidence bar to reverse-engineer, where there is no source to read

20 no-exploit not reached Nothing to build a rule from yet: no published exploit, no CISA record of exploitation and no source-level change to read

21 secure-rule-match not reached A vulnerability class already blocked by an ARMR security rule

22 exploited-no-fix-or-poc not reached Somebody exploiting this CVE (a CISA or VulnCheck KEV listing, or a CISA verdict of active exploitation), with no fix, source code or PoC to build a rule from

23 below-action-threshold not reached Medium or Low severity, no CISA or VulnCheck KEV listing, no PoC clearing the evidence bar, no CISA verdict, no Oracle advisory

24 no-exploit-published not reached Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all

NVD ↗ · CVE.org ↗