How severe is CVE-2021-20376?

CVE-2021-20376 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2021-20376 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20376?

CVE-2021-20376 affects Ibm Sterling B2b Integrator. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20376?

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

When was CVE-2021-20376 published?

CVE-2021-20376 was published on 2021-10-07 and last updated on 2026-06-17.

CVE-2021-20376

CVE-2021-20376 is a medium-severity vulnerability in Ibm Sterling B2b Integrator with a CVSS 3.x base score of 4.3. 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-203.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 4.0
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-203
Affected product: Ibm Sterling B2b Integrator
Published: 2021-10-07
Last modified: 2026-06-17

Description

IBM Sterling File Gateway 2.2.0.0 through 6.1.1.0 could allow an authenticated attacker to enumerate usernames due to there being an observable discrepancy in returned messages. IBM X-Force ID: 195568.

Frequently asked questions

What is CVE-2021-20376?: IBM Sterling File Gateway 2.2.0.0 through 6.1.1.0 could allow an authenticated attacker to enumerate usernames due to there being an observable discrepancy in returned messages. IBM X-Force ID: 195568.
How severe is CVE-2021-20376?: CVE-2021-20376 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2021-20376 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20376?: CVE-2021-20376 affects Ibm Sterling B2b Integrator. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20376?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-20376 published?: CVE-2021-20376 was published on 2021-10-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ibm:sterling_b2b_integrator:*:*:*:*:*:*:*:*

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