CVE-2023-33973

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 1.0%, top 42% 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
Elevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

RIOT-OS, an operating system for Internet of Things (IoT) devices, contains a network stack with the ability to process 6LoWPAN frames. In versions 2023.01 and prior, an attacker can send a crafted frame which is forwarded by the device. During encoding of the packet a NULL pointer dereference occurs. This crashes the device leading to denial of service. A patch is available at pull request 19678. There are no known workarounds.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
60%
KEV
Not listed

Published

May 30, 2023

Last Modified

November 21, 2024

References (16)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 25× 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.

Showing the most recent 100 of 175 total refreshes for this CVE.

  1. 2026-09-24 14:01 UTCEPSS rescore
  2. 2026-09-24 14:01 UTCEPSS rescore
  3. 2026-09-23 13:45 UTCEPSS rescore
  4. 2026-09-23 10:53 UTCOSV refresh
  5. 2026-09-22 14:45 UTCEPSS rescore
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  7. 2026-09-16 14:05 UTCEPSS rescore
  8. 2026-09-13 16:44 UTCEPSS rescore
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  17. 2026-09-04 05:46 UTCOSV refresh
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  1. 2026-08-25 13:46 UTCEPSS rescore
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  3. 2026-08-23 00:17 UTCEPSS rescore
  4. 2026-08-21 23:47 UTCEPSS rescore
  5. 2026-08-20 22:53 UTCEPSS rescore
  6. 2026-08-19 17:02 UTCEPSS rescore
  7. 2026-08-18 13:46 UTCEPSS rescore
  8. 2026-08-17 16:29 UTCOSV refresh
  9. 2026-08-17 13:45 UTCEPSS rescore
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  23. 2026-08-04 10:35 UTCEPSS rescore
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  25. 2026-08-02 11:57 UTCOSV refresh
  26. 2026-08-02 02:25 UTCEPSS rescore
  27. 2026-08-01 04:13 UTCEPSS rescore
  28. 2026-07-30 16:26 UTCEPSS rescore
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  37. 2026-07-23 14:16 UTCEPSS rescore
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  39. 2026-07-23 02:23 UTCEG score recompute
  40. 2026-07-22 23:10 UTCEG score recompute
  41. 2026-07-22 14:06 UTCEPSS rescore
  42. 2026-07-21 15:23 UTCEPSS rescore
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  44. 2026-07-20 17:06 UTCEPSS rescore
  45. 2026-07-19 14:29 UTCEPSS rescore
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  47. 2026-07-19 02:27 UTCEPSS rescore
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  49. 2026-07-18 10:03 UTCEPSS rescore
  50. 2026-07-18 10:03 UTCEPSS rescore
  51. 2026-07-16 17:01 UTCEPSS rescore
  52. 2026-07-15 19:19 UTCOSV refresh
  53. 2026-07-15 16:56 UTCEPSS rescore
  54. 2026-07-15 16:56 UTCEPSS rescore
  55. 2026-07-15 01:58 UTCEPSS rescore
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  57. 2026-07-13 22:28 UTCEPSS rescore
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  67. 2026-07-07 13:44 UTCEPSS rescore
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  72. 2026-07-04 06:29 UTCEPSS rescore
  73. 2026-07-02 16:59 UTCEPSS rescore
  74. 2026-07-01 15:04 UTCEPSS rescore
  75. 2026-06-30 23:21 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2023-33973?
CVE-2023-33973 is a high vulnerability published on May 30, 2023. RIOT-OS, an operating system for Internet of Things (IoT) devices, contains a network stack with the ability to process 6LoWPAN frames. In versions 2023.01 and prior, an attacker can send a crafted frame which is forwarded by the device. During encoding of the packet a NULL pointer dereference…
When was CVE-2023-33973 disclosed?
CVE-2023-33973 was first published in the National Vulnerability Database on May 30, 2023, 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-2023-33973 actively exploited?
CVE-2023-33973 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 40.0% of all scored CVEs.
What is the CVSS score of CVE-2023-33973?
CVE-2023-33973 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2023-33973?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-33973, 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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