Known exploited vulnerability · CISA KEV

CVE-2016-3081: Apache Struts Command Injection Vulnerability

Apache Struts contains a command injection vulnerability that could allow remote attackers to execute arbitrary code via method:prefix when Dynamic Method Invocation is enabled.

CVE-2016-3081

Exploited in the wild. Fix this first.

CISA added it to the Known Exploited Vulnerabilities catalog on 2026-10-08: attackers are using it right now.

CISA KEV: Listed; Added 2026-10-08 · federal fix-by 2026-10-11
EPSS (30 days): 97%; Higher than 99.9% of CVEs · 2026-11-01
CVSS v3.1: 8.1 High; CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

What CISA says

Apache Struts Command Injection Vulnerability

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

NVD description · published 2016-04-26

Apache Struts 2.3.19 to 2.3.20.2, 2.3.21 to 2.3.24.1, and 2.3.25 to 2.3.28, when Dynamic Method Invocation is enabled, allow remote attackers to execute arbitrary code via method: prefix, related to chained expressions.

Full record on NVD

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How to check if you are exposed to CVE-2016-3081

Find every Apache Struts system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
Compare each version with the fixed versions in the vendor advisory below. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2016-3081.

US federal agencies had to fix this by 2026-10-11. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.

Affected versions

Versions the National Vulnerability Database lists as vulnerable to CVE-2016-3081. Check the vendor advisory for the exact fixed builds before you sign anything off.

Product	Vulnerable versions
Apache Struts	from 2.3.20 before 2.3.20.3; from 2.3.21 before 2.3.24.3; from 2.3.25 before 2.3.28.1
Huawei Agile Controller-Campus Firmware	v100r002c00
Huawei Anyoffice	v200r005c00; v200r006c00
Huawei Logcenter	v100r001c10; v100r001c20
Huawei Firehunter6000 Firmware	v100r001c20
Huawei Oceanstor 5300 V3 Firmware	v300r001; v300r002; v300r003c00; v300r003c10

NVD lists 14 more affected products; see the full record on NVD.

Timeline

2016-04-26 · Published in the National Vulnerability Database
2026-10-08 · Added to CISA's Known Exploited Vulnerabilities catalog, 3,817 days after it was published
2026-10-11 · Fix-by date for US federal agencies, passed 21 days ago

Vendor advisories and fixes

https://cwiki.apache.org/confluence/display/WW/S2-032

Weakness type

CWE-77

More exploited Apache vulnerabilities

CISA lists 41 exploited Apache vulnerabilities. The closest matches:

Keep going

Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.