How severe is CVE-2016-6424?

CVE-2016-6424 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2016-6424 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-6424?

CVE-2016-6424 primarily affects Cisco Adaptive Security Appliance Software. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-6424?

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

When was CVE-2016-6424 published?

CVE-2016-6424 was published on 2016-10-06 and last updated on 2026-06-17.

CVE-2016-6424

CVE-2016-6424 is a medium-severity vulnerability in Cisco Adaptive Security Appliance Software 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-399.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 6.1
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Cisco Adaptive Security Appliance Software
Published: 2016-10-06
Last modified: 2026-06-17

Description

The DHCP Relay implementation in Cisco Adaptive Security Appliance (ASA) Software 8.4.7.29 and 9.1.7.4 allows remote attackers to cause a denial of service (interface wedge) via a crafted rate of DHCP packet transmission, aka Bug ID CSCuy66942.

Frequently asked questions

What is CVE-2016-6424?: The DHCP Relay implementation in Cisco Adaptive Security Appliance (ASA) Software 8.4.7.29 and 9.1.7.4 allows remote attackers to cause a denial of service (interface wedge) via a crafted rate of DHCP packet transmission, aka Bug ID CSCuy66942.
How severe is CVE-2016-6424?: CVE-2016-6424 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2016-6424 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-6424?: CVE-2016-6424 primarily affects Cisco Adaptive Security Appliance Software. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-6424?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2016-6424 published?: CVE-2016-6424 was published on 2016-10-06 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:o:cisco:adaptive_security_appliance_software:8.4.7.29:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.1\(7\)4:*:*:*:*:*:*:*

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CVE-2015-0335 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2015-0333 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2014-4121 — Critical (CVSS 10.0): Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, 4.5, 4.5.1, and 4.5.2 does not properly parse internationalized…
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