CVE-2020-28975

Exp

svm_predict_values in svm.cpp in Libsvm v324, as used in scikit-learn 0.23.2 and other products, allows attackers to cause a denial of service (segmentation fault) via a crafted model SVM (introduced via pickle, json, or any other model permanence standard) with a large value in the _n_support array. NOTE: the scikit-learn vendor's position is that the behavior can only occur if the library's API is violated by an application that changes a private attribute.

Published: 2020-11-21 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]

NVD Status：Modified，CVE State: published

View at NVD, CVE.org, EUVD

Threat Intelligence & Risk Assessment for CVE-2020-28975

EPSS CVSS GHSA Exploit-DB Affected OS Tracker

Conclusion & alert: CVE-2020-28975 is rated High Exploit Risk (78.8/100): CVSS High severity, with medium exploitation likelihood (EPSS 3.43%). Core evidence: 3 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +3.18% over the last day, indicating growing attacker interest. Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2020-28975

EDB-ID	Source	Kind	Link
—	nvd_ref	exploit_tag	Exploit-DB ↗
—	nvd_ref	exploit_tag	Exploit-DB ↗
—	nvd_ref	exploit_tag	Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2020-28975

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.25%	3.43%	+3.18%
2	2026-03-17	0.81%	0.25%	-0.56%
3	2026-01-12	—	0.81%	—

Full EPSS history (17 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-28975

CVSS metrics for this CVE.

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.5	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	3.6	[email protected]
5.0	2.0	MEDIUM	`AV:N/AC:L/Au:N/C:N/I:N/A:P` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:N) No authentication is required. Confidentiality impact (C:N) No confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:P) Partial availability impact.	10.0	2.9	[email protected]

Weakness enumeration for CVE-2020-28975

GitHub Security Advisory for CVE-2020-28975

GHSA-jxfp-4rvq-9h9m · Severity: high · Ecosystem: pip — scikit-learn Denial of Service

OS Trackers for CVE-2020-28975

vendor	priority	summary	link
`gentoo`	low	CVE-2020-28975: 1 GLSA(s) (202301-03), 1 atom(s) (sci-libs/scikit-learn); latest impact low.	https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-28975
`ubuntu`	medium	CVE-2020-28975 medium priority: Ubuntu including 1 source packages (libsvm), 13 status rows across 13 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, trusty, upstream, xenial): ignored 6, not-affected 5, DNE 1, needs-triage 1.	https://ubuntu.com/security/CVE-2020-28975

Affected software / configurations for CVE-2020-28975

Vendor	Product	Version	Raw CPE
scikit-learn	scikit-learn	>= 0.23.2, < 1.0.1	cpe:2.3:a:scikit-learn:scikit-learn::::::::

References for CVE-2020-28975

URL	Tags
http://packetstormsecurity.com/files/160281/SciKit-Learn-0.23.2-Denial-Of-Service.html	Exploit Third Party Advisory VDB Entry
http://seclists.org/fulldisclosure/2020/Nov/44	Mailing List Third Party Advisory
https://github.com/cjlin1/libsvm/blob/9a3a9708926dec87d382c43b203f2ca19c2d56a0/svm.cpp#L2501	Exploit Third Party Advisory
https://github.com/scikit-learn/scikit-learn/commit/1bf13d567d3cd74854aa8343fd25b61dd768bb85	Patch Third Party Advisory
https://github.com/scikit-learn/scikit-learn/issues/18891	Exploit Issue Tracking Third Party Advisory
https://security.gentoo.org/glsa/202301-03	Third Party Advisory

cvelogic Threat Intelligence