CVE-2019-20792

Physical double free via duplicate object insertion

Published Apr 29, 2020 · Updated Aug 5, 2024

Double-free in OpenSC before 0.20.0 allows attackers to trigger memory corruption via crafted CoolKey object processing. The coolkey_add_object function appends objects without a uniqueness check, so duplicate entries are later released twice by coolkey_free_private_data. Physically proximate attackers can reach the smart-card handling path; the flaw can corrupt memory in the consuming process.

CVSS severity6.8
Medium
EPSS probability0.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double-free in OpenSC before 0.20.0 allows attackers to trigger memory corruption via crafted CoolKey object processing. The coolkey_add_object function appends objects without a uniqueness check, so duplicate entries are later released twice by coolkey_free_private_data. Physically proximate attackers can reach the smart-card handling path; the flaw can corrupt memory in the consuming process.

The record

CVE
CVE-2019-20792
Published
Apr 29, 2020
Updated
Aug 5, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 29, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.8NVDCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.6NVDAV:L/AC:L/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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