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 observ…

published 2021-10-07 5y ago modified 2026-06-17 4mo ago also EUVD-2021-7794

cvss: 4.3; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits: 0; none known

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.

Patch / fix

links 1

ibm.com/support/pages/node/6496789 advisory

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Exploit prediction

0.73% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CNA	3.0	4.3	CVSS:3.0/I:N/AC:L/PR:L/AV:N/UI:N/A:N/C:L/S:U/RL:O/E:U/RC:C
NVD	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CNA	3.0	4.3	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
NVD	2.0	4.0	AV:N/AC:L/Au:S/C:P/I:N/A:N

Affected products

IBM Sterling File Gateway

Classification

Weakness

CWE-203 Observable Discrepancy

References

ibm.com /support/pages/node/6496789
patch, vendor-advisory
exchange.xforce.ibmcloud.com /vulnerabilities/195568
vdb-entry, vendor-advisory

Sources

CVE List CVE-2021-20376
NVD CVE-2021-20376

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