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Fencer Vulns
critical 9.8

CVE-2020-17530 kev in the critical feed json

Remote code execution in Apache Struts

published 2020-12-11 5 y ago modified 2026-06-17 4 mo ago also GHSA-jc35-q369-45pv , EUVD-2022-1073

cvss
9.8
version 3.1, CNA
cisa kev
Exploited
added 2021-11-03
epss
96.3%
EPSS 96.3% chance of exploitation in 30 days, percentile 99.8%
public exploits
1
Metasploit, plus a Nuclei check

Summary

Forced OGNL evaluation, when evaluated on raw user input in tag attributes, may lead to remote code execution. Affected software : Apache Struts 2.0.0 - Struts 2.5.25.

Patch / fix

cisa required action Apply updates per vendor instructions.

  • maven org.apache.struts:struts2-core 2.5.26
  • apache struts 2.5.30

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-17530 updated cvss 8.1

struts2: using forced OGNL evaluation on untrusted user input can lead to a RCE and security degradation

  • Red Hat JBoss Enterprise Application Platform 6 struts struts Red Hat JBoss Fuse 6 struts-core Red Hat JBoss Fuse Service Works 6 struts struts Red Hat JBoss Operations Network 3 struts struts
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. First public exploit (Metasploit exploit/multi/http/struts2_multi_eval_ognl)
  2. Published
  3. Added to CISA KEV
  4. CISA patch deadline
  5. CISA SSVC: exploitation active

Known exploited

Added
5 y ago
Patch by
2022-05-03 (4 y ago)
Ransomware
Not known
Required action
Apply updates per vendor instructions.
Vendor, product
Apache, Struts
CISA name
Apache Struts Remote Code Execution Vulnerability

ATT&CK techniques

How it is exploited and what it leads to, in MITRE ATT&CK terms.

  • T1190 Exploit Public-Facing Application exploitation
  • T1059 Command and Scripting Interpreter primary impact

kev release 2025-07-28, att&ck v16.1. KEV to ATT&CK mappings by the MITRE Center for Threat-Informed Defense (Mappings Explorer, Apache-2.0). © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. Terms of use

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
yes
Technical impact
total
Assessed
21 mo ago

Exploit prediction

96.25% chance of exploitation in the next 30 days, higher than 99.8% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H

Affected packages

ecosystem package affected fixed in
maven org.apache.struts:struts2-core
>=2.0.0, <2.5.26
2.5.26

Affected products

  • Apache Software Foundation Apache Struts

Classification

Weakness
  • CWE-917 Improper Neutralization of Special Elements used in an Expression Language Statement
  • CWE-94 Improper Control of Generation of Code

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.