How severe is CVE-2016-6415?

CVE-2016-6415 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 high, integrity none, and availability none.

Is CVE-2016-6415 being actively exploited?

Yes. CVE-2016-6415 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2023-05-19, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2016-6415?

CVE-2016-6415 primarily affects Cisco Ios. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-6415?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2016-6415 have an EU (EUVD) identifier?

Yes. CVE-2016-6415 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2016-7338. It is also flagged as exploited in the EUVD (since 2023-05-19).

When was CVE-2016-6415 published?

CVE-2016-6415 was published on 2016-09-19 and last updated on 2026-06-17.

CVE-2016-6415

CVE-2016-6415 is a high-severity vulnerability in Cisco Ios with a CVSS 3.x base score of 7.5. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2023-05-19). The underlying weakness is classified as CWE-200.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 88% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2023-05-19)
EU (EUVD) id: EUVD-2016-7338
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2023-05-19)
Weakness: CWE-200
Affected product: Cisco Ios
Published: 2016-09-19
Last modified: 2026-06-17

Description

The server IKEv1 implementation in Cisco IOS 12.2 through 12.4 and 15.0 through 15.6, IOS XE through 3.18S, IOS XR 4.3.x and 5.0.x through 5.2.x, and PIX before 7.0 allows remote attackers to obtain sensitive information from device memory via a Security Association (SA) negotiation request, aka Bug IDs CSCvb29204 and CSCvb36055 or BENIGNCERTAIN.

Frequently asked questions

What is CVE-2016-6415?: The server IKEv1 implementation in Cisco IOS 12.2 through 12.4 and 15.0 through 15.6, IOS XE through 3.18S, IOS XR 4.3.x and 5.0.x through 5.2.x, and PIX before 7.0 allows remote attackers to obtain sensitive information from device memory via a Security Association (SA) negotiation request, aka Bug IDs CSCvb29204 and CSCvb36055 or BENIGNCERTAIN.
How severe is CVE-2016-6415?: CVE-2016-6415 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 high, integrity none, and availability none.
Is CVE-2016-6415 being actively exploited?: Yes. CVE-2016-6415 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2023-05-19, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2016-6415?: CVE-2016-6415 primarily affects Cisco Ios. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-6415?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2016-6415 have an EU (EUVD) identifier?: Yes. CVE-2016-6415 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2016-7338. It is also flagged as exploited in the EUVD (since 2023-05-19).
When was CVE-2016-6415 published?: CVE-2016-6415 was published on 2016-09-19 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*

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