How severe is CVE-2021-20573?

CVE-2021-20573 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-20573 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20573?

CVE-2021-20573 primarily affects Ibm Security Identity Manager Adapter. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-20573?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-20573 published?

CVE-2021-20573 was published on 2021-06-28 and last updated on 2026-06-17.

CVE-2021-20573

CVE-2021-20573 is a medium-severity vulnerability in Ibm Security Identity Manager Adapter with a CVSS 3.x base score of 6.5. 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-787.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 1% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Ibm Security Identity Manager Adapter
Published: 2021-06-28
Last modified: 2026-06-17

Description

IBM Security Identity Manager Adapters 6.0 and 7.0 are vulnerable to a heap-based buffer overflow, caused by improper bounds checking. A remote authenticated attacker could overflow the and cause the server to crash. IBM X-Force ID: 199249.

Frequently asked questions

What is CVE-2021-20573?: IBM Security Identity Manager Adapters 6.0 and 7.0 are vulnerable to a heap-based buffer overflow, caused by improper bounds checking. A remote authenticated attacker could overflow the and cause the server to crash. IBM X-Force ID: 199249.
How severe is CVE-2021-20573?: CVE-2021-20573 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-20573 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20573?: CVE-2021-20573 primarily affects Ibm Security Identity Manager Adapter. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-20573?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-20573 published?: CVE-2021-20573 was published on 2021-06-28 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:ibm:security_identity_manager_adapter:6.0.0.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:security_identity_manager_adapter:7.0.0.0:*:*:*:*:*:*:*

More vulnerabilities in Ibm Security Identity Manager Adapter

CVE-2021-20574 — High (CVSS 8.8): IBM Security Identity Manager Adapters 6.0 and 7.0 could allow a remote authenticated attacker to conduct an LDAP…
CVE-2016-0340 — High (CVSS 7.4): IBM Security Identity Manager (ISIM) Virtual Appliance 7.0.0.0 through 7.0.1.1 before 7.0.1-ISS-SIM-FP0003 mishandles…
CVE-2016-0330 — High (CVSS 7.3): IBM Security Identity Manager (ISIM) Virtual Appliance 7.0.0.0 through 7.0.1.1 before 7.0.1-ISS-SIM-FP0003 mishandles…
CVE-2021-20572 — Medium (CVSS 6.5): IBM Security Identity Manager Adapters 6.0 and 7.0 are vulnerable to a stack-based buffer overflow, caused by improper…
CVE-2021-20494 — Medium (CVSS 6.5): IBM Security Identity Manager Adapters 6.0 and 7.0 are vulnerable to a heap based buffer overflow, caused by improper…
CVE-2016-0338 — Medium (CVSS 6.2): IBM Security Identity Manager (ISIM) Virtual Appliance 7.0.0.0 through 7.0.1.1 before 7.0.1-ISS-SIM-FP0003 allows local…

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