How severe is CVE-2020-4839?

CVE-2020-4839 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-4839 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-4839?

CVE-2020-4839 primarily affects Ibm 8335-gca Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-4839?

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

When was CVE-2020-4839 published?

CVE-2020-4839 was published on 2021-05-25 and last updated on 2026-06-17.

CVE-2020-4839

CVE-2020-4839 is a medium-severity vulnerability in Ibm 8335-gca Firmware with a CVSS 3.x base score of 4.9. 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 4.9)
CVSS v2: 4.0
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Ibm 8335-gca Firmware
Published: 2021-05-25
Last modified: 2026-06-17

Description

IBM Host firmware for LC-class Systems is vulnerable to a stack based buffer overflow, caused by improper bounds checking. A remote privileged attacker could exploit this vulnerability and cause a denial of service. IBM X-Force ID: 190037.

Frequently asked questions

What is CVE-2020-4839?: IBM Host firmware for LC-class Systems is vulnerable to a stack based buffer overflow, caused by improper bounds checking. A remote privileged attacker could exploit this vulnerability and cause a denial of service. IBM X-Force ID: 190037.
How severe is CVE-2020-4839?: CVE-2020-4839 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-4839 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-4839?: CVE-2020-4839 primarily affects Ibm 8335-gca Firmware. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-4839?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-4839 published?: CVE-2020-4839 was published on 2021-05-25 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:o:ibm:8335-gca_firmware:op820:*:*:*:*:*:*:*
cpe:2.3:o:ibm:8335-gta_firmware:op820:*:*:*:*:*:*:*
cpe:2.3:o:ibm:8335-gtb_firmware:op820:*:*:*:*:*:*:*

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