How severe is CVE-2017-6957?

CVE-2017-6957 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2017-6957 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-6957?

CVE-2017-6957 affects Broadcom Bcm4339 Soc Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-6957?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2017-6957 published?

CVE-2017-6957 was published on 2017-03-27 and last updated on 2026-06-17.

CVE-2017-6957

CVE-2017-6957 is a high-severity vulnerability in Broadcom Bcm4339 Soc Firmware with a CVSS 3.x base score of 8.1. 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-119.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 6.8
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Broadcom Bcm4339 Soc Firmware
Published: 2017-03-27
Last modified: 2026-06-17

Description

Stack-based buffer overflow in the firmware in Broadcom Wi-Fi HardMAC SoC chips, when the firmware supports CCKM Fast and Secure Roaming and the feature is enabled in RAM, allows remote attackers to execute arbitrary code via a crafted reassociation response frame with a Cisco IE (156).

Frequently asked questions

What is CVE-2017-6957?: Stack-based buffer overflow in the firmware in Broadcom Wi-Fi HardMAC SoC chips, when the firmware supports CCKM Fast and Secure Roaming and the feature is enabled in RAM, allows remote attackers to execute arbitrary code via a crafted reassociation response frame with a Cisco IE (156).
How severe is CVE-2017-6957?: CVE-2017-6957 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2017-6957 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-6957?: CVE-2017-6957 affects Broadcom Bcm4339 Soc Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-6957?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2017-6957 published?: CVE-2017-6957 was published on 2017-03-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:broadcom:bcm4339_soc_firmware:6.37.34.40:*:*:*:*:*:*:*

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