How severe is CVE-2020-4420?

CVE-2020-4420 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-4420 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-4420?

CVE-2020-4420 primarily affects Ibm Db2. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-4420?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-4420 published?

CVE-2020-4420 was published on 2020-07-01 and last updated on 2026-06-17.

CVE-2020-4420

CVE-2020-4420 is a high-severity vulnerability in Ibm Db2 with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-404.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-404
Affected product: Ibm Db2
Published: 2020-07-01
Last modified: 2026-06-17

Description

IBM DB2 for Linux, UNIX and Windows (includes DB2 Connect Server) 9.7, 10.1, 10.5, 11.1, and 11.5 could allow an unauthenticated attacker to cause a denial of service due a hang in the execution of a terminate command. IBM X-Force ID: 180076.

Frequently asked questions

What is CVE-2020-4420?: IBM DB2 for Linux, UNIX and Windows (includes DB2 Connect Server) 9.7, 10.1, 10.5, 11.1, and 11.5 could allow an unauthenticated attacker to cause a denial of service due a hang in the execution of a terminate command. IBM X-Force ID: 180076.
How severe is CVE-2020-4420?: CVE-2020-4420 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-4420 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-4420?: CVE-2020-4420 primarily affects Ibm Db2. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-4420?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-4420 published?: CVE-2020-4420 was published on 2020-07-01 and last updated on 2026-06-17.

References

Affected products (5)

cpe:2.3:a:ibm:db2:9.7.0.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:db2:10.1.0.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:db2:10.5.0.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:db2:11.1.0.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:db2:11.5.0.0:*:*:*:*:*:*:*

More vulnerabilities in Ibm Db2

CVE-2012-1797 — Critical (CVSS 10.0): IBM DB2 9.5 uses world-writable permissions for nodes.reg, which has unspecified impact and attack vectors.
CVE-2010-3731 — Critical (CVSS 10.0): Stack-based buffer overflow in the validateUser implementation in the com.ibm.db2.das.core.DasSysCmd function in…
CVE-2010-3193 — Critical (CVSS 10.0): Unspecified vulnerability in the DB2STST program in IBM DB2 9.1 before FP9, 9.5 before FP6, and 9.7 before FP2 has…
CVE-2009-4335 — Critical (CVSS 10.0): Multiple unspecified vulnerabilities in bundled stored procedures in the Spatial Extender component in IBM DB2 9.5…
CVE-2009-3473 — Critical (CVSS 10.0): IBM DB2 9.1 before FP8 does not require the SETSESSIONUSER privilege for the SET SESSION AUTHORIZATION statement, which…
CVE-2008-6821 — Critical (CVSS 10.0): Buffer overflow in the DAS server in IBM DB2 8 before FP17, 9.1 before FP5, and 9.5 before FP2 might allow attackers to…

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