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ExploitedIn CISA KEVFix available

CVE-2016-6415

Exploitation confirmed. First attested on 2023-05-19 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2016-09-19
  • WeaknessCWE-200

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2016-09-1901:59CVE publishedNVD
  2. 2023-05-19Listed as exploited by GCVEGCVE
  3. 2023-05-19Added to the CISA KEV catalogCISA KEV
  4. 2023-05-19Exploitation first reportedCISA KEV
  5. 2024-11-0817:38SSVC exploitation set to activeCISA-ADP
  6. 2026-10-2319:23EPSS crossed 10 %FIRST EPSS
  7. 2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2016-6415?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-6415?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Cisco ios
BranchAffectedFixed in
12.x≥ 12.2, ≤ 12.4no fix published
15.x≥ 15.0, ≤ 15.6no fix published
Cisco ios xr
BranchAffectedFixed in
5.x≥ 5.0.0, < 5.3.05.3.0
4.3≥ 4.3.0, ≤ 4.3.4no fix published
Cisco ios xe
BranchAffectedFixed in
3.18≤ 3.18sno fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. CISA’s required action: Apply updates per vendor instructions.due 2023-06-09

Advisories and patches

Detection

read 2026-10-23 19:23 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverified3ndG4me/CVE-2016-6415-BenignCertain-Monitor
PoC-in-GitHub

CISA Known Exploited Vulnerability

Date Added
2023-05-19
Patch Due Date
2023-06-09
Ransomware Use
Unknown
Required Action
Apply updates per vendor instructions.

Sources

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2016-09-19
Last Modified
2026-06-17
NVD status
Analyzed

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.

Is CVE-2016-6415 actively exploited?

Yes. CVE-2016-6415 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2023-06-09.

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

CVE-2016-6415 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».

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