CVE-2020-15350

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 36% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
70.8%
KEV
Not listed

Published

July 7, 2020

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated Jun 11, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
github_pr

sys/base64: Fix, unit test cleanup, and benchmark

Fix merged in RIOT-OS/RIOT PR #14400 on 2020-07-02 — awaiting tagged release

https://github.com/RIOT-OS/RIOT/pull/14400

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-13 22:27 UTCEPSS rescore
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  1. 2026-06-27 03:06 UTCEPSS rescore
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  9. 2026-06-21 14:54 UTCEPSS rescore
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  22. 2026-06-12 23:10 UTCEPSS rescore
  23. 2026-06-11 13:58 UTCEPSS rescore
  24. 2026-06-10 22:16 UTCEPSS rescore
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  39. 2026-06-02 20:11 UTCEPSS rescore
  40. 2026-06-02 20:11 UTCEPSS rescore
  41. 2026-06-01 13:50 UTCEPSS rescore
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  43. 2026-05-31 22:29 UTCEPSS rescore
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  45. 2026-05-31 00:15 UTCEPSS rescore
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  47. 2026-05-29 13:42 UTCEPSS rescore
  48. 2026-05-28 13:43 UTCEPSS rescore
  49. 2026-05-28 13:43 UTCEPSS rescore
  50. 2026-05-27 13:39 UTCEPSS rescore
  51. 2026-05-27 01:34 UTCEG score recompute
  52. 2026-05-27 01:34 UTCGHSA enrichment
  53. 2026-05-26 13:42 UTCEPSS rescore
  54. 2026-05-26 13:42 UTCEPSS rescore
  55. 2026-05-26 07:17 UTCEPSS rescore
  56. 2026-05-26 07:17 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2020-15350?
CVE-2020-15350 is a critical vulnerability published on July 7, 2020. RIOT 2020.04 has a buffer overflow in the base64 decoder. The decoding function base64decode() uses an output buffer estimation function to compute the required buffer capacity and validate against the provided buffer size. The base64estimatedecodesize() function calculates the expected decoded…
When was CVE-2020-15350 disclosed?
CVE-2020-15350 was first published in the National Vulnerability Database on July 7, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-15350 actively exploited?
CVE-2020-15350 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 70.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2020-15350?
CVE-2020-15350 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2020-15350?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-15350, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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