VulnerabilityModified

CVE-2017-3207

CRITICAL 9.8EPSS 8.08%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (8.08%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

The Java implementations of AMF3 deserializers in WebORB for Java by Midnight Coders, version 5.1.1.0, 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.

CVSS 3.0: 9.8 CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 8.08% probability · 95th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-502
Affected: themidnightcoders/weborb for java
Source: cret@cert.org

EPSS trend

EPSS moved from 7.1% on 21 September 2026 to 8.1% on 27 October 2026, peaking at 8.2% on 22 September 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.

References

http://www.securityfocus.com/bid/97384Third Party Advisory, VDB Entry
http://www.securityweek.com/flaws-java-amf-libraries-allow-remote-code-executionThird Party Advisory
https://codewhitesec.blogspot.com/2017/04/amf.htmlExploit, Third Party Advisory
https://www.kb.cert.org/vuls/id/307983Third Party Advisory, US Government Resource
http://www.securityfocus.com/bid/97384Third Party Advisory, VDB Entry
http://www.securityweek.com/flaws-java-amf-libraries-allow-remote-code-executionThird Party Advisory
https://codewhitesec.blogspot.com/2017/04/amf.htmlExploit, Third Party Advisory
https://www.kb.cert.org/vuls/id/307983Third Party Advisory, US Government Resource

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.