ntop nDPI 3.4 has a stack-based buffer overflow in processClientServerHello.

published 2021-07-01 5y ago modified 2026-06-17 4mo ago also EUVD-2021-22715

cvss: 8.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.8%; EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits: 0; none known

Patch / fix

distros 1 links 2

ndpi Debian 14, Debian 13, Debian 12 4.0-1

debian advisories DEBIAN-CVE-2021-36082

github.com/ntop/nDPI@1ec621c commit
bugs.chromium.org/p/oss-fuzz/issues/detail?id=30393 advisory

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Exploit prediction

1.76% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

bugs.chromium.org https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=30393 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	2.0	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness

CWE-787 Out-of-bounds Write

References

github.com /ntop/nDPI/commit/1ec621c85b9411cc611652fd57a892cfef478af3
patch, third-party-advisory
bugs.chromium.org /p/oss-fuzz/issues/detail?id=30393
exploit, issue-tracking, patch, third-party-advisory
github.com /google/oss-fuzz-vulns/blob/main/vulns/ndpi/OSV-2021-304.yaml
third-party-advisory

Sources

CVE List CVE-2021-36082
NVD CVE-2021-36082

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.