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TI-2002-01485 Aliases CVE-2002-1563GHSA-6234-fx93-pwcr

stunnel 4.0.3 and earlier allows attackers to cause a denial of service (crash) via…

Priority LOW 8Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
— Not recorded in CVSS 2.0
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
None · None · Partial
Fix status
Fixed

Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat.

Summary

stunnel 4.0.3 and earlier allows attackers to cause a denial of service (crash) via SIGCHLD signal handler race conditions that cause an inconsistency in the child counter.

Why it matters now

EPSS 0.00337 27th percentileScored 2026-11-07
Fix Fixed Red Hat: 3 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:stunnel:stunnel:4.04:*:*:*:*:*:*:*4.04VulnerableStunnel
  • cpe:2.3:a:stunnel:stunnel:4.04:*:*:*:*:*:*:* Versions 4.04 Vulnerable ·Stunnel

Remediation

Red Hat 3 advisories

  • RHSA-2003:296 Released 2003-11-24 · Red Hat rating Important
    : Updated stunnel packages available
    • Red Hat Linux 7.1
    • Red Hat Linux 7.2
    • Red Hat Linux 7.3
    • Red Hat Linux 8.0
  • RHSA-2003:223 Released 2003-07-25 · Red Hat rating Important
    stunnel security update
    • Red Hat Enterprise Linux AS (Advanced Server) version 2.1
    • Red Hat Enterprise Linux ES version 2.1
    • Red Hat Enterprise Linux WS version 2.1
    • Red Hat Linux Advanced Workstation 2.1
  • RHSA-2003:221 Released 2003-07-25 · Red Hat rating Important
    : Updated stunnel packages fix signal vulnerability
    • Red Hat Linux 7.1
    • Red Hat Linux 7.2
    • Red Hat Linux 7.3
    • Red Hat Linux 8.0

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux AS (Advanced Server) version 2.1 Fixed RHSA-2003:223
Red Hat Enterprise Linux ES version 2.1Fixed RHSA-2003:223
Red Hat Enterprise Linux WS version 2.1Fixed RHSA-2003:223
Red Hat Linux 7.1Fixed RHSA-2003:221
Red Hat Linux 7.2Fixed RHSA-2003:221
Red Hat Linux 7.3Fixed RHSA-2003:221
Red Hat Linux 8.0Fixed RHSA-2003:221
Red Hat Linux Advanced Workstation 2.1Fixed RHSA-2003:223

Timeline

  1. 2026-10-02 Threatist record created from CVE-2002-1563
  2. 2026-10-03 Alias added: GHSA-6234-fx93-pwcr

References

Patch 1

Advisory 4

Other 2

  • TI-2011-02592 stunnel 4.40 and 4.41 might allow remote attackers to execute arbitrary code or cause a… CVSS 2.0HIGH 9.3
  • TI-2001-00060 Format string vulnerability in stunnel 3.8 and earlier allows attackers to execute… CVSS 2.0HIGH 10.0
  • TI-2002-00002 Format string vulnerability in stunnel before 3.22 when used in client mode for (1) smtp… CVSS 2.0HIGH 7.5
  • TI-2021-03525 Improper certificate validation in stunnel CVSS 3.1HIGH 7.5
  • TI-2013-01549 stunnel 4.21 through 4.54, when CONNECT protocol negotiation and NTLM authentication are… CVSS 2.0MEDIUM 6.6
  • TI-2008-02320 The OCSP functionality in stunnel before 4.24 does not properly search certificate… CVSS 2.0MEDIUM 6.8
See all 11 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences