What’s Vulnerable › Vulnerabilities

CVE-2020-24753

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-09-17 · updated 2026-06-17
• Weakness: CWE-755

Description

A memory corruption vulnerability in Objective Open CBOR Run-time (oocborrt) in versions before 2020-08-12 could allow an attacker to execute code via crafted Concise Binary Object Representation (CBOR) input to the cbor2json decoder. An uncaught error while decoding CBOR Major Type 3 text strings leads to the use of an attacker-controllable uninitialized stack value. This can be used to modify memory, causing a crash or potentially exploitable heap corruption.

Affected products

• Objective Open Cbor Run-Time Project Objective Open Cbor Run-Time: before 2020-08-12 — fixed in 2020-08-12

How to fix

Upgrade to a fixed version: Objective Open Cbor Run-Time Project Objective Open Cbor Run-Time 2020-08-12. Check the vendor advisory for mitigations.

References

• https://github.com/objsys/oocborrt/commit/539851c66778f68a244633985f6f8d0df94ea3b3
• https://warcollar.com/cve-2020-24753.html
• https://github.com/objsys/oocborrt/commit/539851c66778f68a244633985f6f8d0df94ea3b3
• https://warcollar.com/cve-2020-24753.html

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