How severe is CVE-2016-1399?

CVE-2016-1399 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2016-1399 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-1399?

CVE-2016-1399 primarily affects Cisco Ios. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-1399?

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-2016-1399 published?

CVE-2016-1399 was published on 2016-05-14 and last updated on 2026-06-17.

CVE-2016-1399

CVE-2016-1399 is a high-severity vulnerability in Cisco Ios with a CVSS 3.x base score of 7.5. 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: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Cisco Ios
Published: 2016-05-14
Last modified: 2026-06-17

Description

The packet-processing microcode in Cisco IOS 15.2(2)EA, 15.2(2)EA1, 15.2(2)EA2, and 15.2(4)EA on Industrial Ethernet 4000 devices and 15.2(2)EB and 15.2(2)EB1 on Industrial Ethernet 5000 devices allows remote attackers to cause a denial of service (packet data corruption) via crafted IPv4 ICMP packets, aka Bug ID CSCuy13431.

Frequently asked questions

What is CVE-2016-1399?: The packet-processing microcode in Cisco IOS 15.2(2)EA, 15.2(2)EA1, 15.2(2)EA2, and 15.2(4)EA on Industrial Ethernet 4000 devices and 15.2(2)EB and 15.2(2)EB1 on Industrial Ethernet 5000 devices allows remote attackers to cause a denial of service (packet data corruption) via crafted IPv4 ICMP packets, aka Bug ID CSCuy13431.
How severe is CVE-2016-1399?: CVE-2016-1399 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2016-1399 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-1399?: CVE-2016-1399 primarily affects Cisco Ios. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-1399?: 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-2016-1399 published?: CVE-2016-1399 was published on 2016-05-14 and last updated on 2026-06-17.

References

Affected products (6)

cpe:2.3:o:cisco:ios:15.2\(2\)eb:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)eb1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:ios:15.2\(2\)ea2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:ios:15.2\(4\)ea:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)ea:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.2\(2\)ea1:*:*:*:*:*:*:*

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