Known exploited vulnerability
CVE-2020-17530
The short answer
CVE-2020-17530 affects Apache Software Foundation Apache Struts and is rated critical (CVSS 9.8). CISA added it to the Known Exploited Vulnerabilities catalog on 2021-11-03: attackers are using it, so patch it first. Fixed versions are published for struts2-core (2.5.26).
What it is
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.
Weakness: CWE-917.
Severity
9.8 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Nov 3, 2021
Federal due date May 3, 2022
EPSS, next 30 days
96%
Higher than 100% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply updates per vendor instructions.
Affected packages and fixed versions
| Package | Ecosystem | Fixed in | Advisory |
|---|---|---|---|
| org.apache.struts:struts2-core | Maven | 2.5.26 | GHSA-jc35-q369-45pv |
Is it in your code? Drop your lockfile into the free vulnerability check, or let vulnerability watch check your repository every day and open the upgrade as a pull request.
Affected products
Apache Struts. NVD's record lists the exact affected versions.
References
- cwiki.apache.org/confluence/display/WW/S2-061 Vendor Advisory
- security.netapp.com/advisory/ntap-20210115-0005/ PatchThird Party Advisory
- www.oracle.com//security-alerts/cpujul2021.html PatchThird Party Advisory
- www.oracle.com/security-alerts/cpuApr2021.html PatchThird Party Advisory
- www.oracle.com/security-alerts/cpuapr2022.html Third Party Advisory
- www.oracle.com/security-alerts/cpujan2021.html PatchThird Party Advisory
- www.oracle.com/security-alerts/cpujan2022.html PatchThird Party Advisory
- www.oracle.com/security-alerts/cpuoct2021.html PatchThird Party Advisory
- cwiki.apache.org/confluence/display/WW/S2-061 Vendor Advisory
- security.netapp.com/advisory/ntap-20210115-0005/ PatchThird Party Advisory
- www.oracle.com//security-alerts/cpujul2021.html PatchThird Party Advisory
- www.oracle.com/security-alerts/cpuApr2021.html PatchThird Party Advisory
Questions
Is CVE-2020-17530 being exploited?
Yes. CISA added CVE-2020-17530 to its Known Exploited Vulnerabilities catalog on 2021-11-03, with a federal remediation due date of 2022-05-03.
How do I fix CVE-2020-17530?
Upgrade to a fixed version: org.apache.struts:struts2-core (Maven) 2.5.26. CISA's required action: Apply updates per vendor instructions.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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