Cisco IOS, IOS XR, and IOS XE IKEv1 Information Disclosure Vulnerability
Cisco IOS, IOS XR, and IOS XE contain insufficient condition checks in the part of the code that handles Internet Key Exchange version 1 (IKEv1) security negotiation requests. contains an information disclosure vulnerability in the Internet Key Exchange version 1 (IKEv1) that could allow an attacker to retrieve memory contents. Successful exploitation could allow the attacker to retrieve memory contents, which can lead to information disclosure.
- Vendor
- Cisco
- Product
- IOS, IOS XR, and IOS XE
- CVSS
- 7.5
- EPSS (exploit probability)
- 87.7%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2016-6415 being exploited?
Yes. CISA added CVE-2016-6415 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 87.7% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-11-13. Full cross-catalog view: /kev-comparison
CVE-2016-6415 timeline
Every event links to its source. Catalog dates are each catalog's own; day offsets count from NVD publication. Data: JSON
What to do
CISA required actionApply updates per vendor instructions.
US federal civilian agencies must remediate by (21 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other Cisco IOS, IOS XR, and IOS XE CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2018-0175 Cisco IOS, XR, and XE Software Buffer Overflow Vulnerability | [ HIGH ] | 8.0 | 3.5% | |
| CVE-2018-0167 Cisco IOS, XR, and XE Software Buffer Overflow Vulnerability | [ HIGH ] | 8.8 | 3.4% |