How severe is CVE-2023-26021?

CVE-2023-26021 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-2023-26021 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-26021?

CVE-2023-26021 primarily affects Ibm Db2. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-26021?

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-2023-26021 published?

CVE-2023-26021 was published on 2023-04-28 and last updated on 2026-06-17.

CVE-2023-26021

CVE-2023-26021 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-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Ibm Db2
Published: 2023-04-28
Last modified: 2026-06-17

Description

IBM Db2 for Linux, UNIX and Windows (includes Db2 Connect Server) 11.1 and 11.5 is vulnerable to a denial of service as the server may crash when compiling a specially crafted SQL query using a LIMIT clause. IBM X-Force ID: 247864.

Frequently asked questions

What is CVE-2023-26021?: IBM Db2 for Linux, UNIX and Windows (includes Db2 Connect Server) 11.1 and 11.5 is vulnerable to a denial of service as the server may crash when compiling a specially crafted SQL query using a LIMIT clause. IBM X-Force ID: 247864.
How severe is CVE-2023-26021?: CVE-2023-26021 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-2023-26021 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-26021?: CVE-2023-26021 primarily affects Ibm Db2. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-26021?: 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-2023-26021 published?: CVE-2023-26021 was published on 2023-04-28 and last updated on 2026-06-17.

References

Affected products (8)

cpe:2.3:a:ibm:db2:*:*:*:*:*:*:*:*
cpe:2.3:a:ibm:db2:11.1.4:-:*:*:*:*:*:*
cpe:2.3:a:ibm:db2:11.1.4:fp1:*:*:*:*:*:*
cpe:2.3:a:ibm:db2:11.1.4:fp2:*:*:*:*:*:*
cpe:2.3:a:ibm:db2:11.1.4:fp3:*:*:*:*:*:*
cpe:2.3:a:ibm:db2:11.1.4:fp4:*:*:*:*:*:*
cpe:2.3:a:ibm:db2:11.1.4:fp5:*:*:*:*:*:*
cpe:2.3:a:ibm:db2:11.1.4:fp6:*:*:*:*:*:*

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.
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