ntopng CVE-2026-38968
CRITICALSeverity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Remote and unauthenticated (AV:N/PR:N), but predicting a time-seeded ID tied to a victim login raises complexity (AC:H); session takeover yields full C/I of the account, no direct availability loss (A:N).
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
ntopng through 6.6 is vulnerable to Predictable Session Identifier which can lead to Session Hijacking. HTTP session identifiers in src/HTTPserver.cpp use weak time-seeded pseudo-randomness during session creation. As a result, fresh authenticated logins can receive deterministic or colliding session cookies under attacker-controlled timing.
AnalysisAI
Session hijacking in ntopng versions through 6.6 arises because HTTP session identifiers are generated with weak, time-seeded pseudo-randomness in src/HTTPserver.cpp, making freshly issued authenticated session cookies predictable or collision-prone. Remote attackers who can influence or observe login timing can forecast a valid session token and take over an authenticated user's session without credentials. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the ntopng web/HTTP server to be reachable by the attacker and a fresh authenticated login to occur that the attacker can time or influence ('under attacker-controlled timing,' per the description) - the weakness is the time-seeded PRNG used for session-cookie creation in src/HTTPserver.cpp. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals conflict and should be weighed carefully. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who can reach the ntopng web console (e.g., an exposed monitoring appliance) triggers or observes an administrator login and, knowing the session ID is seeded from time, computes the small set of candidate cookies and replays a valid one to assume the admin's authenticated session. With that session the attacker reads sensitive network flow/telemetry data and alters monitoring configuration. … |
| Remediation | Upstream fix available (PR/commit); released patched version not independently confirmed - apply the corrected session-ID generation from ntop's commits 179a346ceb6239fd36128ccca3efa8f9ea61eeb5 and 14e22497233dc7d31d19dccb74b13bb073d16c2c by upgrading to a build that incorporates them (track ntop's release notes for the first tagged release past 6.6 that includes these fixes, as an exact patched version number is not confirmed in the provided data). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all ntopng deployments with versions 6.6 or earlier; restrict administrative access via firewall rules limiting to trusted networks and VPN only. …
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Same weakness CWE-341 – Predictable from Observable State
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External POC / Exploit Code
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