CVE-2017-3203 json
Pivotal/Spring Spring-flex's Action Message Format (AMF3) Java implementation is vulnerable to insecure deserialization
published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also GHSA-8v4h-j42h-wfhc , EUVD-2022-3232
- cvss
- 8.1
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 6.2%
- EPSS 6.2% chance of exploitation in 30 days, percentile 93%
- public exploits
- 0
- none known
Summary
The Java implementations of AMF3 deserializers in Pivotal/Spring Spring-flex derive class instances from java.io.Externalizable rather than the AMF3 specification's recommendation of flash.utils.IExternalizable. A remote attacker with the ability to spoof or control an RMI server connection may be able to send serialized Java objects that execute arbitrary code when deserialized.
Exploit prediction
6.23% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- codewhitesec.blogspot.com https://codewhitesec.blogspot.com/2017/04/amf.html referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 8.1 | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
| GitHub | 3.0 | 8.1 | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | org.springframework.flex:spring-flex | <=1.5.2.RELEASE |
no fix listed |
Affected products
- Pivotal/Spring Spring-flex
Classification
- Weakness
-
- CWE-502 Deserialization of Untrusted Data
References
-
codewhitesec.blogspot.com
/2017/04/amf.html
web, exploit, mitigation, third-party-advisory
-
kb.cert.org
/vuls/id/307983
third-party-advisory, web, us-government-resource
-
securityweek.com
/flaws-java-amf-libraries-allow-remote-code-execution
web, third-party-advisory
-
securityfocus.com
/bid/97376
vdb-entry, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2017-3203
advisory
Sources
- CVE List CVE-2017-3203
- GitHub Advisory GHSA-8v4h-j42h-wfhc
- NVD CVE-2017-3203
Fencer Intel 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.