What is CVE-2017-7957?

CVE-2017-7957 is a high-severity vulnerability in Xstream, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2017-04-29.

How severe is CVE-2017-7957?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2017-7957 known to be exploited?

15 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Improper input validation in Xstream

CVE-2017-7957

XStream through 1.4.9, when a certain denyTypes workaround is not used, mishandles attempts to create an instance of the primitive type 'void' during unmarshalling, leading to a remote application crash, as demonstrated by an xstream.fromXML("<void/>") call.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2017-04-29 · last modified 2026-10-08.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.049 (92.0th percentile), scored 2026-10-20.

Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 92.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.049 · newest: 0.049 · change: 0.000

Affected products

Xstream
Debian Linux — versions 8.0, 9.0
Red Hat Fuse — versions 1.0
Red Hat Jboss Middleware — versions 1

Weakness classification (CWE)

CWE-20 — Improper Input Validation

Public proof-of-concept exploits

References

access.redhat.com/errata/RHSA-2017:2888 (vendor-advisory, Third Party Advisory)
access.redhat.com/errata/RHSA-2017:1832 (vendor-advisory, Third Party Advisory)
access.redhat.com/errata/RHSA-2017:2889 (vendor-advisory, Third Party Advisory)
www.securitytracker.com/id/1039499 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
www-prd-trops.events.ibm.com/node/715749 (Permissions Required, Broken Link)
exchange.xforce.ibmcloud.com/vulnerabilities/125800 (VDB Entry, Third Party Advisory, vdb-entry)
www.debian.org/security/2017/dsa-3841 (vendor-advisory, Mailing List, Third Party Advisory)
x-stream.github.io/CVE-2017-7957.html (Vendor Advisory)
www.securityfocus.com/bid/100687 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)

Frequently asked questions

What is CVE-2017-7957?: CVE-2017-7957 is a high-severity vulnerability in Xstream, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2017-04-29.
How severe is CVE-2017-7957?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2017-7957 known to be exploited?: 15 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.