THREATPORT/VULNERABILITY/CVE-2008-4109
MEDIUM SEVERITY

CVE-2008-4109

Linux vulnerability

CVSS
5.0
EPSS
28.6%
EPSS pct
98th
Exploited
No known
A certain Debian patch for OpenSSH before 4.3p2-9etch3 on etch; before 4.6p1-1 on sid and lenny; and on other distributions such as SUSE uses functions that are not async-signal-safe in the signal handler for login timeouts, which allows remote attackers to cause a denial of service (connection slot exhaustion) via multiple login attempts. NOTE: this issue exists because of an incorrect fix for CVE-2006-5051.
Affected vendor
Debian
Affected product
Linux
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness type (CWE)
  • CWE-264 — Permissions, Privileges, and Access Controls
Published
2008-09-18

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no authentication. Successful exploitation leads to partial impact to availability.

Its EPSS score of 28.6% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 98% of all scored CVEs.

Check your external exposure to CVE-2008-4109

  • Confirm whether Debian Linux is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2008-4109.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2008-4109

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2008-4109 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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