8.5

CVE-2015-5600: openbsd openssh

Modified
AliasesMGASA-2015-0295UBUNTU-CVE-2015-5600DEBIAN-CVE-2015-5600
Published 03-08-2015Last modified 27-05-2026

Vulnerability summary

CVE-2015-5600 is a high (CVSS 8.5) vulnerability in openbsd openssh. EPSS estimates a 9.38% chance of exploitation in the next 30 days, higher than 95.4% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Prioritisepublic exploit

Public exploit (reference, Date unknown)

Source freshness unavailable

How is this decided?
CVSS score
8.5/10
010
High · v2.0 (NVD)
EPSS score
9.38%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 9 · Related 5
DLA-1500-1DLA-288-1RHSA-2015:2088RHSA-2016:0466SUSE-SU-2015:1544-1SUSE-SU-2015:1581-1

Timeline

  1. 03-08-2015
    PublishedVulnerability first disclosed.
  2. 27-05-2026
    Last modifiedVulnerability information updated.

Description

The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processing of keyboard-interactive devices within a single connection, which makes it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

9.38%

Chance of exploitation in the next 30 days

Percentile

95%

Versus all other CVEs

30-day change

No change 0.00 pp

From 9.38% 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

1 found
  • referenceUnverified

    Exploit Reference (seclists.org)

    Maturity: unknown

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.

Mageia2 products
  • openssh< 6.2p2-3.4.mga4
  • openssh< 6.6p1-5.3.mga5
Debian1 product
  • openssh< 1:6.9p1-1
Openbsd1 product
Ubuntu1 product
  • openssh< 1:6.6p1-2ubuntu2.2

4 vendors · 5 products

References

40 links
Show all 40 references