CVE-2020-6096

8.1 HIGH 5% exploit odds No fix listed Code execution

What it is

An exploitable signed comparison vulnerability exists in the ARMv7 memcpy() implementation of GNU glibc 2.30.9000. Calling memcpy() (on ARMv7 targets that utilize the GNU glibc implementation) with a negative value for the 'num' parameter results in a signed comparison vulnerability. If an attacker underflows the 'num' parameter to memcpy(), this vulnerability could lead to undefined behavior such as writing to out-of-bounds memory and potentially remote code execution. Furthermore, this memcpy() implementation allows for program execution to continue in scenarios where a segmentation fault or crash should have occurred. The dangers occur in that subsequent execution and iterations of this code will be executed with this corrupted data.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.
Exploit odds: 5.5% chance of exploitation in the next 30 days (EPSS).
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2020-01-07 00:00 UTC ReservedThe CVE id was reserved by its CNA
2020-04-01 22:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-10-14 09:17 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 5.5% in the next 30 days (EPSS).
Severity: 8.1 HIGH (CVSS).
Fix: none linked yet, which raises it.

Details

Published: 2020-04-01 22:15 UTC
Last modified: 2026-10-14 09:17 UTC
Exploit probability: 5.5% · EPSS, next 30 days
Weakness: CWE-195
Record status: Modified

Affected

Gnu Glibc ≤ 2.31
Fedoraproject Fedora 31
Fedoraproject Fedora 32
Debian Linux 10.0

Attack profile CVSS 3.1 · 8.1

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Raw vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Is it in your code?

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References

NVD record · CVE.org record