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Vulnerability Assessment

Weakness
CWE
CWE-908
ASVS 5.0
V15 - Secure Coding and Architecture Variable initialization
Impact

CVSS score of 9.3 (CRITICAL). Attack characteristics: network attack vector, M complexity. EPSS exploitation probability: 13.16%.
Exploit ScenarioDerived

A remote attacker could access uninitialized memory causing crashes or information disclosure by sending crafted requests to the affected application.
Act Now Prioritize within 24-48h. Why: CRITICAL severity.
Patch available 13.2% exploitation probability (EPSS)

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AnalysisAI

The C+ mode offload emulation in the RTL8139 network card device model in QEMU, as used in Xen 4.5.x and earlier, allows remote attackers to read process heap memory via unspecified vectors. Rated critical severity (CVSS 9.3), this vulnerability is remotely exploitable. Epss exploitation probability 13.2%.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Initialize all variables, use compiler warnings for uninitialized access, use memory-safe languages.

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Technical ContextAI · show details

This vulnerability is classified as Use of Uninitialized Resource (CWE-908), which allows attackers to access uninitialized memory causing crashes or information disclosure. The C+ mode offload emulation in the RTL8139 network card device model in QEMU, as used in Xen 4.5.x and earlier, allows remote attackers to read process heap memory via unspecified vectors. Affected products include: Xen, Fedoraproject Fedora, Suse Linux Enterprise Debuginfo, Suse Linux Enterprise Server, Debian Debian Linux.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 9.3 CRITICAL
AV:N/AC:M/Au:N/C:C/I:C/A:C

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
M
Confidentiality
C
Integrity
C
Availability
C

DescriptionCVE.org

The C+ mode offload emulation in the RTL8139 network card device model in QEMU, as used in Xen 4.5.x and earlier, allows remote attackers to read process heap memory via unspecified vectors.

Threat Intelligence Overview

EPSS Score
13.2%
Top 6% exploitable
Data Quality
3 sources
Confidence: Low
Citrix NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity CRITICAL
CISA KEV No
Public POC No
EPSS 13.2%
Patch available Yes
Active threat No
Deciding rule
CRITICAL severity
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

59
Low Medium High Critical
KEV: 0
EPSS: +13
CVSS: +46
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)CVE.org

cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.5.1:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:21:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:*
cpe:2.3:a:suse:linux_enterprise_debuginfo:11:sp1:*:*:*:*:*:*
cpe:2.3:o:suse:linux_enterprise_server:10:sp4:*:*:ltss:*:*:*
cpe:2.3:o:suse:linux_enterprise_server:11:sp1:*:*:ltss:*:*:*
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openstack:5.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openstack:6.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:virtualization:3.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_compute_node_eus:7.1:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_compute_node_eus:7.2:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_compute_node_eus:7.3:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_compute_node_eus:7.4:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_compute_node_eus:7.5:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_compute_node_eus:7.6:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_compute_node_eus:7.7:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
+ 45 more

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Same weakness CWE-908 – Use of Uninitialized Resource

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9.3
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5.5
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CVE-2021-29937 CRITICAL POC
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CVE-2021-29936 CRITICAL POC
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CVE-2019-9641 CRITICAL POC
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Same technique Information Disclosure

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CVE-2019-2725 CRITICAL POC
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9.0
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9.8
CVE-2017-5638 CRITICAL POC
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CVE-2025-24813 CRITICAL POC
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CVE-2025-68613 HIGH POC
8.8
CVE-2015-1701 HIGH POC
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CVE-2017-0147 HIGH POC
7.5

References

Advisories & patches
PATCH http://xenbits.xen.org/xsa/advisory-140.html REF http://lists.fedoraproject.org/pipermail/package-announce/2015-September/165373.html REF http://lists.fedoraproject.org/pipermail/package-announce/2015-September/167792.html REF http://lists.fedoraproject.org/pipermail/package-announce/2015-September/167820.html REF http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00018.html REF http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00027.html REF http://rhn.redhat.com/errata/RHSA-2015-1674.html REF http://rhn.redhat.com/errata/RHSA-2015-1683.html REF http://rhn.redhat.com/errata/RHSA-2015-1739.html REF http://rhn.redhat.com/errata/RHSA-2015-1740.html REF http://rhn.redhat.com/errata/RHSA-2015-1793.html REF http://rhn.redhat.com/errata/RHSA-2015-1833.html REF http://support.citrix.com/article/CTX201717 REF http://www.debian.org/security/2015/dsa-3348 REF http://www.debian.org/security/2015/dsa-3349 REF http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html REF http://www.securityfocus.com/bid/76153 REF http://www.securitytracker.com/id/1033176 REF https://www.arista.com/en/support/advisories-notices/security-advisories/1180-security-advisory-13

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