8.6

CVE-2015-8555: citrix xenserver

Modified
AliasesUBUNTU-CVE-2015-8555DEBIAN-CVE-2015-8555
Published 13-04-2016Last modified 06-08-2024

Vulnerability summary

CVE-2015-8555 is a high (CVSS 8.6) vulnerability in citrix xenserver. EPSS estimates a 2.25% chance of exploitation in the next 30 days, higher than 82.9% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 8.6 (NVD); no exploitation reported by the 5 checked sources; EPSS 2% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
8.6/10
010
High · v3.0 (NVD)
EPSS score
2.25%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 9 · Related 6
DLA-479-1DSA-3519-1MGASA-2016-0098OPENSUSE-SU-2024:10196-1SUSE-SU-2016:0873-1SUSE-SU-2016:0955-1

Timeline

  1. 13-04-2016
    PublishedVulnerability first disclosed.
  2. 06-08-2024
    Last modifiedVulnerability information updated.

Description

Xen 4.6.x, 4.5.x, 4.4.x, 4.3.x, and earlier do not initialize x86 FPU stack and XMM registers when XSAVE/XRSTOR are not used to manage guest extended register state, which allows local guest domains to obtain sensitive information from other domains via unspecified vectors.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

2.25%

Chance of exploitation in the next 30 days

Percentile

83%

Versus all other CVEs

30-day change

No change 0.00 pp

From 2.25% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Citrix1 product
Debian1 product
  • xen< 4.8.0~rc3-1
Ubuntu1 product
  • xen< 4.4.2-0ubuntu0.14.04.4
Xen1 product
  • xen4.3.0 | 4.3.1 | 4.3.2 | 4.3.3 | 4.3.4 | 4.4.0 | 4.4.1 | 4.4.2 | 4.4.3 | 4.4.4 | 4.5.0 | 4.5.1 | 4.5.2 | 4.5.3 | 4.6.0 | 4.6.1

4 vendors · 4 products

References

10 links