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TI-2026-85500 Aliases CVE-2026-97371

Stack buffer overflow in ntopng nDPI custom category detection

Priority MEDIUM 63CWE-121Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

ntopng before 6.7.260721 is affected. Its nDPI custom category detection writes a 4-byte protocol category value into a 2-byte stack variable in IpAddress::reloadBlacklist, a stack-based buffer overflow (CWE-121). A remote unauthenticated attacker on a monitored network segment can send packets that match custom category rules, causing stack corruption and denial of service without user interaction.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

ntopng is a web-based network traffic monitoring application. Prior to 6.7.260721, ndpi_get_custom_category_match writes a four-byte nDPI protocol-category value through a pointer to the two-byte id variable in IpAddress::reloadBlacklist in src/IpAddress.cpp during packet dissection and host initialization. A remote unauthenticated attacker on a monitored network segment can send packets that match custom-category rules, causing stack corruption and denial of service without user interaction. This issue is fixed in version 6.7.260721.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00484 41st percentileScored 2026-11-07
Fix Fixed ntopng (ntop): 6.7.260721

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ntopntopngbefore 6.7.2607216.7.260721Patch availableCNA
  • ntopng Vendorntop Affected before 6.7.260721 Fixed in 6.7.260721 Patch available CNA

Remediation

Update ntopng to version 6.7.260721, which fixes this issue.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA ntopng (ntop) Fixed in 6.7.260721

Timeline

  1. 2026-11-05 Threatist record created from CVE-2026-97371
  2. 2026-11-05 CISA SSVC decision points changed
  3. 2026-11-05 Priority changed: LOW → MEDIUM

References

Other 2

  • TI-2026-58397 ntopng: Missing Authorization on System Configuration Backup Download and Listing CVSS 3.1HIGH 8.8
  • TI-2026-58894 ntopng before 6.7.260717 Missing Authorization on the Host Pool Bulk Delete Handler CVSS 4.0HIGH 7.1
  • TI-2026-58396 ntopng's Missing Authorization in REST API Allows Non-Admin Users to Delete and Rename Arbitrary Tags CVSS 3.1HIGH 7.1
  • TI-2026-28235 ntopng through 6.6 is vulnerable to Predictable Session Identifier which can lead to… CVSS 3.1CRITICAL 9.8
  • TI-2020-09603 In nDPI through 3.2 Stable, the SSH protocol dissector has multiple KEXINIT integer… CVSS 3.1CRITICAL 9.8
  • TI-2018-08982 An issue was discovered in ntopng 3.4 before 3.4.180617. CVSS 3.1HIGH 8.1
See all 31 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences