How severe is CVE-2016-6415?

CVE-2016-6415 has a CVSS score of 7.5/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2016-6415?

Affected package information for CVE-2016-6415 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2016-6415?

No fixed version has been published for CVE-2016-6415 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2016-6415 actively exploited in the wild?

Yes. There are 7 known exploit references for CVE-2016-6415, including 1 documented proof-of-concept exploit on Exploit-DB and 4 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2016-6415?

CVE-2016-6415 has an EPSS (Exploit Prediction Scoring System) score of 92.7%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2016-6415 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2016-6415 (Cisco IOS, IOS XR, and IOS XE IKEv1 Information Disclosure Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2023-05-19. CISA required all US federal civilian agencies to remediate this vulnerability by 2023-06-09. The required action was: Apply updates per vendor instructions. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2016-6415?

CVE-2016-6415 is classified as Information Exposure (CWE-200). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2016-6415?

CVE-2016-6415 affects cisco ios; cisco ios xe; cisco ios xr. Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2016-6415 published, and has it been updated?

CVE-2016-6415 was published on September 19, 2016 and was last updated on April 22, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2023-05-19 — agencies required to remediate by 2023-06-09

CVE-2016-6415

HIGH

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…

Published

Sep 19, 2016

Updated

Apr 22, 2026

Affected

0 pkgs

Patched

None yet

Exploits

7 known

EPSS Exploitation Probability

via FIRST.org ↗

92.7%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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.

Affected Products

3 products · 5 configurations

ioscisco

≥ 15.0 && ≤ 15.6

range

ios xecisco

≤ 3.18s

range

ios xrcisco

≥ 5.0.0 && ≤ 4.3.4

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-43383remotehardware

Cisco IOS 12.2 < 12.4 / 15.0 < 15.6 - Security Association Negotiation Request Device Memory

by nixawk · Mar 17, 2017

Exploit-DB Source

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2016-6415 in your stack?

O3 detects CVE-2016-6415 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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