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Vulnerability record · CVE-2020-4587 · published 24 August 2020

CVE-2020-4587: Ibm connect\ out-of-bounds write vulnerability

Ibm · Connect\

IBM Sterling Connect:Direct for UNIX 4.2.0, 4.3.0, 6.0.0, and 6.1.0 is vulnerable to a stack based buffer ovreflow, caused by improper bounds checking. A local attacker could manipulate CD UNIX to obtain root provileges. IBM X-Force ID: 184578.

7.8 CVSS 3.1 High EPSS 0.34% · top 75.0% CWE-787 · Out-of-bounds write
7.8CVSS 3.1 base score, v2 7.2
0.34%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

IBM Sterling Connect:Direct for UNIX 4.2.0, 4.3.0, 6.0.0, and 6.1.0 is vulnerable to a stack based buffer ovreflow, caused by improper bounds checking. A local attacker could manipulate CD UNIX to obtain root provileges. IBM X-Force ID: 184578.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://exchange.xforce.ibmcloud.com/vulnerabilities/184578 VDB EntryVendor Advisory
https://www.ibm.com/support/pages/node/6320317 Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/184578 VDB EntryVendor Advisory
https://www.ibm.com/support/pages/node/6320317 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2020-4747Ibm connect\ improper authentication vulnerabilityIBM Connect:Direct for UNIX 6.1.0, 6.0.0, 4.3.0, and 4.2.0 can allow a local or remote user to obtain an authenticated CLI session due to improper au…EPSS 2.0%7.5CVE-2023-32331Ibm sterling connect\ memory buffer overflow vulnerabilityIBM Connect:Express for UNIX 1.5.0 is vulnerable to a buffer overflow that could allow a remote attacker to cause a denial of service through its bro…EPSS 0.70%7.5CVE-2021-38933Ibm sterling connect\ broken cryptographic algorithm vulnerabilityIBM Sterling Connect:Direct for UNIX 1.5 uses weaker than expected cryptographic algorithms that could allow an attacker to decrypt highly sensitive …EPSS 0.39%7.5CVE-2021-38890Ibm sterling connect\ improper restriction of authentication attempts vulnerabilityIBM Sterling Connect:Direct Web Services 1.0 and 6.0 uses an inadequate account lockout setting that could allow a remote attacker to brute force acc…EPSS 1.6%7.5CVE-2021-38891Ibm sterling connect\ inadequate encryption strength vulnerabilityIBM Sterling Connect:Direct Web Services 1.0 and 6.0 uses weaker than expected cryptographic algorithms that could allow an attacker to decrypt highl…EPSS 0.69%7.5CVE-2020-4767Ibm sterling connect\ out-of-bounds read vulnerabilityIBM Sterling Connect Direct for Microsoft Windows 4.7, 4.8, 6.0, and 6.1 could allow a remote attacker to cause a denial of service, caused by a buff…EPSS 1.6%7.2CVE-2025-36137Ibm sterling connect\ execution with unnecessary privileges vulnerabilityIBM Sterling Connect Direct for Unix 6.2.0.7 through 6.2.0.9 iFix004, 6.4.0.0 through 6.4.0.2 iFix001, and 6.3.0.2 through 6.3.0.5 iFix002 incorrectl…EPSS 0.33%6.7CVE-2018-1903Ibm sterling connect\ vulnerabilityIBM Sterling Connect:Direct for UNIX 4.2.0, 4.3.0, and 6.0.0 could allow a user with restricted sudo access on a system to manipulate CD UNIX to gain…EPSS 0.39%

Source: NIST National Vulnerability Database (record CVE-2020-4587), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.