CISA KEV Low Access control exploit reference

CVE-2013-2423 — Oracle JRE Unspecified Vulnerability

Unspecified vulnerability in the Java Runtime Environment (JRE) component in Oracle Java SE 7 Update 17 and earlier, and OpenJDK 7, allows remote attackers to affect integrity via unknown vectors related to HotSpot. NOTE: the previous information is from the April 2013 CPU. Oracle has not commented on claims from the original researcher that this vulnerability allows remote attackers to bypass permission checks by the MethodHandles method and modify arbitrary public final fields using reflection and type confusion, as demonstrated using integer and double fields to disable the security manager.

Published Apr 17, 2013 · Updated Oct 13, 2026 · Sources: CISA Known Exploited Vulnerabilities, NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: oracle

Urgent

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

CISA KEV · May 25, 2022 Metasploit modules · 1 Exploit-DB · 1

How the score was calculated

Confirmed exploitation (CISA KEV)+35
Public exploit/PoC (metasploit, exploitdb)+20
EPSS 85.2% (30-day exploitation probability)+15

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Confirmed

CISA KEV, listed May 25, 2022

EPSS FIRST

85.22%

ahead of 100% of scored CVEs · Oct 14, 2026

Affects

Canonical

Ubuntu Linux and 2 more

CVSS base

3.7

Low · 4 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

Active

none · proof-of-concept · active

Automatable

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

Documented patch — hg.openjdk.java.net (NIST National Vulnerability Database)

CISA required action CISA

Apply updates per vendor instructions.

US federal deadline: Jun 15, 2022 — passed 1583 day(s) ago

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Canonical Ubuntu Linux, Opensuse Opensuse, Oracle Jre).
Treat as emergency remediation: the CVE is in CISA KEV (confirmed exploitation).
The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
Apply the fixed version or the patch documented under Remediation.
EPSS ahead of 100% of scored CVEs: prioritize it in the patch queue.
Search available logs for exploit probes matching the vulnerability class (access control), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Canonical	Ubuntu Linux	version 12.10	Vulnerable	NIST National Vulnerability Database
Opensuse	Opensuse	version 12.3	Vulnerable	NIST National Vulnerability Database
Oracle	Jre	version 1.7.0version 1.7.0-update1version 1.7.0-update10version 1.7.0-update11version 1.7.0-update13version 1.7.0-update15version 1.7.0-update2version 1.7.0-update3 and 5 more version 1.7.0-update4version 1.7.0-update5version 1.7.0-update6version 1.7.0-update7version 1.7.0-update9	Vulnerable	NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

High

Privileges required

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
3.7	CVSS 3.1	Low	2.2	1.4	134c704f-9b21-4f2e-91b3-4a467353bcc0 via NIST National Vulnerability Database
3.7	CVSS 3.1	Low	—	—	GitHub, Inc. via GitHub Security Advisories
3.7	CVSS 3.1	Low	—	—	CISA-ADP via CVE Program (cve.org) e CISA ADP
4.3	CVSS 2.0	Medium	8.6	2.9	nvd@nist.gov via NIST National Vulnerability Database

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N (score shown at the top: 134c704f-9b21-4f2e-91b3-4a467353bcc0)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-284 · Improper Access Control

Other CVEs with this weakness →

CISA KEV details CISA

CISA lists a CVE once it has evidence of exploitation against real targets.

Listed

May 25, 2022

Federal deadline

Jun 15, 2022

passed 1583 day(s) ago

Ransomware use

Unknown

CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a reference date.

Public exploits, PoCs and detection templates

Public code that demonstrates or tests the flaw raises the odds of mass exploitation — and Nuclei templates help find vulnerable assets in your environment.

Metasploit modules

Java Applet Reflection Type Confusion Remote Code Execution excellent Jan 10, 2013

Exploit-DB

Java Applet - Reflection Type Confusion Remote Code Execution (Metasploit) verified Apr 23, 2013

Warning: public PoCs are sometimes disguised malware. Use them only for authorized testing in an isolated environment. This portal does not host exploit code — it only points to the sources.

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 85.22%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
Audit administrative actions and access to resources outside each user’s normal pattern.
Hunt retroactively in logs from before May 25, 2022 (KEV listing): exploitation may have started earlier.

web/proxy/WAF logsnetwork IDS/IPSauthentication logsapplication logs

Timeline

What happened to this CVE, newest first.

2026
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 13, 2026
Fix documented
Oct 13, 2026 · NIST National Vulnerability Database
Affected products added · oracle/jre, canonical/ubuntu linux, opensuse/opensuse
Oct 13, 2026 · NIST National Vulnerability Database
CVSS changed · 3.7
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · → Analyzed
Oct 13, 2026 · NIST National Vulnerability Database
Added to CISA KEV (detected)
Oct 13, 2026 · CISA Known Exploited Vulnerabilities
Record created in this database
Oct 13, 2026 · CISA Known Exploited Vulnerabilities
2022
Added to CISA KEV catalog
May 24, 2022 · CISA
2013
CVE published
Apr 17, 2013 · oracle

Source activity

Repeated readings are counted rather than listed.

2× References added · Oct 13, 2026 – Oct 13, 2026
1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

20 on the record

www.oracle.com/technetwork/topics/security/javacpuapr2013-1928497.html
Vendor Advisory, x_refsource_CONFIRM, NIST National Vulnerability Database
hg.openjdk.java.net/jdk7u/jdk7u-dev/jdk/rev/b453d9be6b3f
Patch, x_refsource_MISC, NIST National Vulnerability Database
www.cisa.gov/known-exploited-vulnerabilities-catalog
US Government Resource, NIST National Vulnerability Database
www.us-cert.gov/ncas/alerts/TA13-107A
Third Party Advisory, US Government Resource, third-party-advisory, x_refsource_CERT, NIST National Vulnerability Database
blog.fuseyism.com/index.php/2013/04/22/security-icedtea-2-3-9-for-openjdk-7-released
GitHub Security Advisories
rhn.redhat.com/errata/RHSA-2013-0752.html
Third Party Advisory, vendor-advisory, x_refsource_REDHAT, NIST National Vulnerability Database
weblog.ikvm.net/PermaLink.aspx
Broken Link, x_refsource_MISC, NIST National Vulnerability Database
www.mandriva.com/security/advisories
Third Party Advisory, vendor-advisory, x_refsource_MANDRIVA, NIST National Vulnerability Database
nvd.nist.gov/vuln/detail/CVE-2013-2423
GitHub Security Advisories
rhn.redhat.com/errata/RHSA-2013-0757.html
Third Party Advisory, vendor-advisory, x_refsource_REDHAT, NIST National Vulnerability Database
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16700
Broken Link, vdb-entry, signature, x_refsource_OVAL, NIST National Vulnerability Database
lists.opensuse.org/opensuse-updates/2013-06/msg00099.html
Third Party Advisory, vendor-advisory, x_refsource_SUSE, NIST National Vulnerability Database
security.gentoo.org/glsa/glsa-201406-32.xml
Third Party Advisory, vendor-advisory, x_refsource_GENTOO, NIST National Vulnerability Database
www.exploit-db.com/exploits/24976
Third Party Advisory, VDB Entry, exploit, x_refsource_EXPLOIT-DB, NIST National Vulnerability Database
github.com/advisories/GHSA-wq4h-35pf-mp23
GitHub Security Advisories
blog.spiderlabs.com/2013/04/java-is-so-confusing.html
Not Applicable, x_refsource_MISC, NIST National Vulnerability Database
wiki.mageia.org/en/Support/Advisories/MGASA-2013-0130
Third Party Advisory, x_refsource_CONFIRM, NIST National Vulnerability Database
blog.fuseyism.com/index.php/2013/04/22/security-icedtea-2-3-9-for-openjdk-7-released/
Broken Link, x_refsource_CONFIRM, NIST National Vulnerability Database
bugzilla.redhat.com/show_bug.cgi
Issue Tracking, x_refsource_CONFIRM, NIST National Vulnerability Database
www.ubuntu.com/usn/USN-1806-1
Third Party Advisory, vendor-advisory, x_refsource_UBUNTU, NIST National Vulnerability Database

Elsewhere on this site

Canonical
every CVE for this vendor

2022-05
what else CISA listed that month

Access control
same class

CWE-284
other pages naming this weakness

Related CVEs (same products)

High CVE-2026-62574 Improper Access Control in Oracle Jre Jul 21, 2026
Medium CVE-2026-60526 Improper Input Validation in Oracle Jdk Jul 21, 2026
Low CVE-2026-60166 Vulnerability in Oracle Java SE (component: JavaFX). The supported version that is… Jul 21, 2026
Low CVE-2026-60164 Vulnerability in Oracle Java SE (component: JavaFX). The supported version that is… Jul 21, 2026
Medium CVE-2026-60147 Improper Access Control in Oracle Jre Jul 21, 2026
High CVE-2026-47063 Improper Access Control in Oracle Jre Jul 21, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2013-2423 is "Oracle JRE Unspecified Vulnerability", rated Low. It affects Ubuntu Linux (Canonical); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 3.7 describes technical severity. EPSS 85.22% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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