CVE-2021-20376

IBM Sterling File Gateway 2.2.0.0 through 6.1.1.0 could allow an authenticated attacker to...

4.3 Medium

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: None
Availability: None

Exploit likelihood

0.73%Up 0.1 points since Oct 8, 2021

What each source reports

CVE List Score used 4.3

Record: CVE-2021-20376
CVSS 3.0: 4.3 MediumCVSS:3.0/I:N/AC:L/PR:L/AV:N/UI:N/A:N/C:L/S:U/RL:O/E:U/RC:C
Updated: 2026-11-02

EUVDEUVD-2021-7794 4.3

Record: EUVD-2021-7794
CVSS 3.0: 4.3 MediumCVSS:3.0/I:N/AC:L/PR:L/AV:N/UI:N/A:N/C:L/S:U/RL:O/E:U/RC:C
Updated: 2026-11-03

GitHub AdvisoriesGHSA-6ww2-4r5v-mm62 4.3

IBM Sterling File Gateway 2.2.0.0 through 6.1.1.0 could allow an authenticated attacker to...

Record: GHSA-6ww2-4r5v-mm62
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness: CWE-200, CWE-203
Updated: 2026-11-02

NVD 4.3

Record: CVE-2021-20376
CVSS 3.1: 4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CVSS 3.0: 4.3 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CVSS 2.0: 4.0 MediumAV:N/AC:L/Au:S/C:P/I:N/A:N
Weakness: CWE-203
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, published	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-20376 is a medium vulnerability (CVSS 4.3) in Ibm Sterling File Gateway, published October 7, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.73%, the 54th percentile. No source names a fixed version.