CVE-2013-0422: Oracle JRE Remote Code Execution Vulnerability

100

Patch now

CRITICAL 9.8EXPLOITEDREMOTEWATCHLISTDOWNGRADEDOWNGRADEMITIGATE

CVE-2013-0422 is a critical-severity flaw (CVSS 9.8) affecting jdk, jre, ubuntu linux, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple vulnerabilities in Oracle Java 7 before Update 11 allow remote attackers to execute arbitrary code by (1) using the public getMBeanInstantiator method in the JmxMBeanServer class to obtain a reference to a private MBeanInstantiator object, then retrieving arbitrary Class references using the findClass method, and (2) using the Reflection API with recursion in a way that bypasses a security check by the java.lang.invoke.MethodHandles.Look

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Exploited in the wild (CISA KEV)
Used in ransomware campaigns
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	97.0% (top 1%)
CISA exploited list	Yes, fix due 2022-06-15, used in ransomware
Weakness	CWE-284
Published	2013-01-10
Last modified	2026-06-16

Publisher (CNA): Oracle · Vendor: canonical · opensuse · oracle

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2013-01-10 21:55 UTCPublished CVE record published
2022-05-25Exploited Added to the CISA Known Exploited Vulnerabilities list
2022-06-15Deadline CISA due date for US federal agencies to patch
2026-06-16 23:49 UTCUpdated Record last modified

oracle jdk DOWNGRADE

Affected: 1.7.0 · 1.7.0 update1 · 1.7.0 update10 · 1.7.0 update2 · 1.7.0 update3 · 1.7.0 update4 · 1.7.0 update5 · 1.7.0 update6

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.7.0

1. Check installed version

apt-cache policy jdk || rpm -q jdk || jdk --version

2. No fixed release: DOWNGRADE to a release before 1.7.0 (Debian / Ubuntu)

apt-cache madison jdk sudo apt install jdk=<VERSION_BEFORE_1.7.0> sudo apt-mark hold jdk

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list jdk sudo dnf downgrade jdk-<VERSION_BEFORE_1.7.0> sudo dnf versionlock add jdk

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

oracle jre DOWNGRADE

Affected: 1.7.0 · 1.7.0 update1 · 1.7.0 update10 · 1.7.0 update2 · 1.7.0 update3 · 1.7.0 update4 · 1.7.0 update5 · 1.7.0 update6

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.7.0

1. Check installed version

apt-cache policy jre || rpm -q jre || jre --version

2. No fixed release: DOWNGRADE to a release before 1.7.0 (Debian / Ubuntu)

apt-cache madison jre sudo apt install jre=<VERSION_BEFORE_1.7.0> sudo apt-mark hold jre

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list jre sudo dnf downgrade jre-<VERSION_BEFORE_1.7.0> sudo dnf versionlock add jre

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

canonical ubuntu linux MITIGATE

Affected: 12.10

Fixed in: no fixed release known

Safe to downgrade to: a release before 12.10

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

opensuse opensuse MITIGATE

Affected: 12.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 12.2

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · perl-Net-IDN-Encode · FIXED · 2.600-1.fc46 · FEDORA-2026-84eff0ea64 · source

sudo dnf upgrade --advisory=FEDORA-2026-84eff0ea64

Fedora ELN · libXISF · FIXED · 0.2.15-2.eln159 · FEDORA-2026-b9e2d1bda0 · source

sudo dnf upgrade --advisory=FEDORA-2026-b9e2d1bda0

RHEL 5 · java-1.7.0-openjdk · FIXED · java-1.7.0-openjdk-1.7.0.9-2.3.4.el5_9.1

sudo dnf upgrade --advisory=RHSA-2013:0165 rpm -q java-1.7.0-openjdk

RHEL 6 · java-1.7.0-openjdk · FIXED · java-1.7.0-openjdk-1.7.0.9-2.3.4.1.el6_3

sudo dnf upgrade --advisory=RHSA-2013:0165 rpm -q java-1.7.0-openjdk

RHEL 5 · java-1.5.0-ibm · NOT AFFECTED

RHEL 5 · java-1.6.0-ibm · NOT AFFECTED

RHEL 6 · java-1.5.0-ibm · NOT AFFECTED

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: partners.immunityinc.com/idocs/Java%20MBeanInstantiator.findClass%200day%20Analysis.pdf
Write-up: threatpost.com/en_us/blogs/nasty-new-java-zero-day-found-exploit-kits-already-have-it-0110
Write-up: www-304.ibm.com/connections/blogs/PSIRT/entry/oracle_java_7_security_manager_bypass_vulner
Exploit-DB: Java Applet JMX - Remote Code Execution (Metasploit) (1)
Metasploit: Java Applet JMX Remote Code Execution

Verify at the official source NVD · CVE Program · CISA KEV catalog · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2013-0422?

jdk: downgrade or apply the listed mitigation; jre: downgrade or apply the listed mitigation; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2013-0422 being exploited?

Yes. CVE-2013-0422 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

What does CVE-2013-0422 affect?

CVE-2013-0422 affects jdk, jre, ubuntu linux. Severity is critical (CVSS 9.8). Multiple vulnerabilities in Oracle Java 7 before Update 11 allow remote attackers to execute arbitrary code by (1) using the public getMBeanInstantiator method in the JmxMBeanServer class to obtain a reference to a private MBeanInstantiator

How urgent is CVE-2013-0422?

Priority 100/100. Critical severity; EPSS top 1%: very likely to be exploited; Exploited in the wild (CISA KEV); Used in ransomware campaigns; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Java vulnerabilities · Ubuntu vulnerabilities

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References

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