How severe is CVE-2020-4259?

CVE-2020-4259 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 high, and availability none.

Is CVE-2020-4259 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-4259?

CVE-2020-4259 affects Ibm Sterling File Gateway. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-4259?

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

When was CVE-2020-4259 published?

CVE-2020-4259 was published on 2020-05-14 and last updated on 2026-06-17.

CVE-2020-4259

CVE-2020-4259 is a medium-severity vulnerability in Ibm Sterling File Gateway 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-276.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-276
Affected product: Ibm Sterling File Gateway
Published: 2020-05-14
Last modified: 2026-06-17

Description

IBM Sterling File Gateway 2.2.0.0 through 6.0.3.1 could allow an authenticated user could manipulate cookie information and remove or add modules from the cookie to access functionality not authorized to. IBM X-Force ID: 175638.

Frequently asked questions

What is CVE-2020-4259?: IBM Sterling File Gateway 2.2.0.0 through 6.0.3.1 could allow an authenticated user could manipulate cookie information and remove or add modules from the cookie to access functionality not authorized to. IBM X-Force ID: 175638.
How severe is CVE-2020-4259?: CVE-2020-4259 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 high, and availability none.
Is CVE-2020-4259 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-4259?: CVE-2020-4259 affects Ibm Sterling File Gateway. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-4259?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-4259 published?: CVE-2020-4259 was published on 2020-05-14 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ibm:sterling_file_gateway:*:*:*:*:*:*:*:*

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