CVE-2020-15350

Name: CVE-2020-15350
Creator: NVD / NIST
Published: 2020-07-07T17:15:10.53+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.47%

Last modified Jun 17, 2026

CVE-2020-15350 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. RIOT 2020.04 has a buffer overflow in the base64 decoder. The decoding function base64_decode() uses an output buffer estimation function to compute the required buffer capacity and validate against the provided buffer size. EPSS estimates a 1.47% chance of exploitation in the next 30 days.

Description

RIOT 2020.04 has a buffer overflow in the base64 decoder. The decoding function base64_decode() uses an output buffer estimation function to compute the required buffer capacity and validate against the provided buffer size. The base64_estimate_decode_size() function calculates the expected decoded size with an arithmetic round-off error and does not take into account possible padding bytes. Due to this underestimation, it may be possible to craft base64 input that causes a buffer overflow.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.47%

70.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Riot-Os	Riot	2020.04

References

https://drive.google.com/file/d/1jMCAi8uawV1-an5uCghIxT2TEdxCE1Lk/view?usp=sharingMailing List, Patch, Third Party Advisory
https://github.com/RIOT-OS/RIOT/pull/14400Patch, Third Party Advisory
https://drive.google.com/file/d/1jMCAi8uawV1-an5uCghIxT2TEdxCE1Lk/view?usp=sharingMailing List, Patch, Third Party Advisory
https://github.com/RIOT-OS/RIOT/pull/14400Patch, Third Party Advisory

Timeline

Published: Jul 7, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-15350?

How severe is CVE-2020-15350?

CVE-2020-15350 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.47% probability of exploitation in the next 30 days.

How do I fix CVE-2020-15350?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-15350?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST