CVE-2016-3093: Apache Struts 2.0.0 through 2.3.24.1 does not properly cache method references when used with OGNL before 3.0.

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MEDIUM 5.3REMOTEWATCHLISTUPGRADEDOWNGRADE

CVE-2016-3093 is a medium-severity flaw (CVSS 5.3) affecting ognl, struts. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Apache Struts 2.0.0 through 2.3.24.1 does not properly cache method references when used with OGNL before 3.0.12, which allows remote attackers to cause a denial of service (block access to a web site) via unspecified vectors.

Why this priority

EPSS top 5%: very likely to be exploited
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	8.4% (top 5%)
CISA exploited list	No
Weakness	CWE-20
Published	2016-06-07
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: apache · ognl project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2016-06-07 18:59 UTCPublished CVE record published
2026-06-17 00:44 UTCUpdated Record last modified

ognl project ognl UPGRADE

Affected: <= 3.0.11

Fixed in: newer than 3.0.11

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 3.0.11 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ognl

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ognl

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

apache struts DOWNGRADE

Affected: 2.0.0 · 2.0.1 · 2.0.2 · 2.0.3 · 2.0.4 · 2.0.5 · 2.0.6 · 2.0.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison struts sudo apt install struts=<VERSION_BEFORE_2.0.0> sudo apt-mark hold struts

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

dnf --showduplicates list struts sudo dnf downgrade struts-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add struts

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.

Verify at the official source NVD · CVE Program · 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-2016-3093?

ognl: upgrade to newer than 3.0.11; struts: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2016-3093 being exploited?

CVE-2016-3093 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2016-3093 affect?

CVE-2016-3093 affects ognl, struts. Severity is medium (CVSS 5.3). Apache Struts 2.0.0 through 2.3.24.1 does not properly cache method references when used with OGNL before 3.0.12, which allows remote attackers to cause a denial of service (block access to a web site) via unspecified vectors.

How urgent is CVE-2016-3093?

Priority 52/100. EPSS top 5%: very likely to be exploited; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Apache Struts vulnerabilities

References

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