6.4

CVE-2015-6563: apple mac_os_x Improper Input Validation

Modified
AliasesUBUNTU-CVE-2015-6563DEBIAN-CVE-2015-6563
Published 24-08-2015Last modified 27-05-2026

Vulnerability summary

CVE-2015-6563 is a medium (CVSS 6.4) Improper Input Validation vulnerability in apple mac_os_x. EPSS estimates a 0.38% chance of exploitation in the next 30 days, higher than 32.2% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 6.4, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
6.4/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.38%
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 6 · Related 4
DLA-1500-1RHSA-2015:2088RHSA-2016:0741SUSE-SU-2015:1544-1SUSE-SU-2015:1581-1SUSE-SU-2015:1695-1

Timeline

  1. 24-08-2015
    PublishedVulnerability first disclosed.
  2. 27-05-2026
    Last modifiedVulnerability information updated.

Description

The monitor component in sshd in OpenSSH before 7.0 on non-OpenBSD platforms accepts extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allows local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.38%

Chance of exploitation in the next 30 days

Percentile

32%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.38% 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: local access, administrative account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Apple1 product
Debian1 product
  • openssh< 1:6.9p1-1
Openbsd1 product
Ubuntu1 product
  • openssh< 1:6.6p1-2ubuntu2.2

4 vendors · 4 products

References

24 links
Show all 24 references