CVE-2017-9805 — Apache Struts Deserialization of Untrusted Data Vulnerability

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

• Documented patch — www.oracle.com (NIST National Vulnerability Database)
• Documented mitigation — cwiki.apache.org (NIST National Vulnerability Database)
• Documented mitigation — struts.apache.org (NIST National Vulnerability Database)
• Maven Org.apache.struts:struts2-rest-plugin: fixed in version 2.5.13 — github.com (GitHub Security Advisories)
• Maven Org.apache.struts:struts2-rest-plugin: fixed in version 2.3.34 — github.com (GitHub Security Advisories)

CISA required action CISA

Apply updates per vendor instructions.

US federal deadline: May 3, 2022 — passed 1626 day(s) ago

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

1. Identify exposed assets running the affected vendor/product/version combinations (Apache Software Foundation Struts, Cisco Digital Media Manager, Cisco Hosted Collaboration Solution…).
2. Treat as emergency remediation: the CVE is in CISA KEV (confirmed exploitation).
3. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
4. Apply the fixed version or the patch documented under Remediation.
5. EPSS ahead of 100% of scored CVEs: prioritize it in the patch queue.
6. Search available logs for exploit probes matching the vulnerability class (insecure deserialization), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-502 · Deserialization of Untrusted Data

Other CVEs with this weakness →

CISA KEV details CISA

CISA lists a CVE once it has evidence of exploitation against real targets.

CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a reference date.

Public exploits, PoCs and detection templates

Public code that demonstrates or tests the flaw raises the odds of mass exploitation — and Nuclei templates help find vulnerable assets in your environment.

Warning: public PoCs are sometimes disguised malware. Use them only for authorized testing in an isolated environment. This portal does not host exploit code — it only points to the sources.

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 99.40%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

• Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
• Monitor serialized objects in requests and unexpected processes spawned by the runtime.
• Hunt retroactively in logs from before Nov 3, 2021 (KEV listing): exploitation may have started earlier.

Timeline

What happened to this CVE, newest first.

• 2026
• Fix documented
  Oct 13, 2026 · GitHub Security Advisories
• Affected products added · maven/org.apache.struts:struts2-rest-plugin
  Oct 13, 2026 · GitHub Security Advisories
• Affected products added · apache software foundation/apache struts
  Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
• SSVC assessment updated
  Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
• Record published
  Oct 13, 2026
• Fix documented
  Oct 13, 2026 · NIST National Vulnerability Database
• Affected products added · apache/struts, cisco/digital media manager, cisco/hosted collaboration solution, cisco/media experience engine, cisco/ne
  Oct 13, 2026 · NIST National Vulnerability Database
• CVSS changed · 8.1
  Oct 13, 2026 · NIST National Vulnerability Database
• Source status changed · → Analyzed
  Oct 13, 2026 · NIST National Vulnerability Database
• Added to CISA KEV (detected)
  Oct 13, 2026 · CISA Known Exploited Vulnerabilities
• Record created in this database
  Oct 13, 2026 · CISA Known Exploited Vulnerabilities
• 2021
• Added to CISA KEV catalog
  Nov 2, 2021 · CISA
• 2017
• CVE published
  Sep 15, 2017 · apache

Source activity

Repeated readings are counted rather than listed.

• 2× References added · Oct 13, 2026 – Oct 13, 2026
• 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

21 on the record

• struts.apache.org/docs/s2-052.html
  Mitigation, Vendor Advisory, x_refsource_CONFIRM, NIST National Vulnerability Database
• cwiki.apache.org/confluence/display/WW/S2-052
  Mitigation, Vendor Advisory, x_refsource_CONFIRM, NIST National Vulnerability Database
• blogs.apache.org/foundation/entry/apache-struts-statement-on-equifax
  Vendor Advisory, x_refsource_CONFIRM, NIST National Vulnerability Database
• www.oracle.com/technetwork/security-advisory/alert-cve-2017-9805-3889403.html
  Patch, Third Party Advisory, x_refsource_CONFIRM, NIST National Vulnerability Database
• www.cisa.gov/known-exploited-vulnerabilities-catalog
  US Government Resource, NIST National Vulnerability Database
• web.archive.org/web/20170909031344/http://www.securityfocus.com/bid/100609
  GitHub Security Advisories
• web.archive.org/web/20170922053119/http://www.securitytracker.com/id/1039263
  GitHub Security Advisories
• github.com/apache/struts/commit/19494718865f2fb7da5ea363de3822f87fbda26
  GitHub Security Advisories
• www.securitytracker.com/id/1039263
  Broken Link, Third Party Advisory, VDB Entry, vdb-entry, x_refsource_SECTRACK, NIST National Vulnerability Database
• lgtm.com/blog/apache_struts_CVE-2017-9805
  Broken Link, x_refsource_MISC, NIST National Vulnerability Database
• nvd.nist.gov/vuln/detail/CVE-2017-9805
  GitHub Security Advisories
• github.com/advisories/GHSA-gg9m-fj3v-r58c
  GitHub Security Advisories
• www.securityfocus.com/bid/100609
  Broken Link, Third Party Advisory, VDB Entry, vdb-entry, x_refsource_BID, NIST National Vulnerability Database
• www.exploit-db.com/exploits/42627
  GitHub Security Advisories
• security.netapp.com/advisory/ntap-20170907-0001/
  Third Party Advisory, x_refsource_CONFIRM, NIST National Vulnerability Database
• security.netapp.com/advisory/ntap-20170907-0001
  GitHub Security Advisories
• github.com/apache/struts/commit/6dd6e5cfb7b5e020abffe7e8091bd63fe97c10a
  GitHub Security Advisories
• bugzilla.redhat.com/show_bug.cgi
  Issue Tracking, Third Party Advisory, VDB Entry, x_refsource_CONFIRM, NIST National Vulnerability Database
• tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170907-strut
  Third Party Advisory, vendor-advisory, x_refsource_CISCO, NIST National Vulnerability Database
• www.kb.cert.org/vuls/id/112992
  Third Party Advisory, US Government Resource, third-party-advisory, x_refsource_CERT-VN, NIST National Vulnerability Database
• www.exploit-db.com/exploits/42627/
  Exploit, Third Party Advisory, VDB Entry, exploit, x_refsource_EXPLOIT-DB, NIST National Vulnerability Database

Elsewhere on this site

Related CVEs (same products)

• High CVE-2026-104714 Apache Struts: Shared message formatter exposes date and time values across concurrent requests 10d
• High CVE-2026-104712 Apache Struts: Disproportionate response size when rendering BigDecimal request parameters 10d
• Medium CVE-2026-104713 Apache Struts: Unbounded request body read in the REST plugin 10d
• Critical CVE-2026-104711 Apache Struts: OGNL injection in the legacy RESTful action mapper 10d
• High CVE-2025-68493 Apache Struts, Apache Struts: XXE vulnerability in outdated XWork component Jan 11, 2026
• High CVE-2025-66675 Apache Struts: File leak in multipart request processing causes disk exhaustion (DoS) - version ranges fixed Dec 10, 2025

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

• No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
• No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
• No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2017-9805 is "Apache Struts Deserialization of Untrusted Data Vulnerability", rated High. It affects Struts (Apache Software Foundation); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 8.1 describes technical severity. EPSS 99.40% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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