CVE-2021-35977

CRITICALNVD 9.89.8—Trending — 3 sources updated this week

9.8

An issue was discovered in Digi RealPort for Windows through 4.8.488.0. A buffer overflow exists in the handling of ADDP discovery response messages. This could result in arbitrary code execution.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 77.6%
KEV: Not listed

Published

October 8, 2021

Last Modified

November 21, 2024

References (2)

cve@mitrehttps://raw.githubusercontent.com/reidmefirst/vuln-disclosure/main/2021-02.txt
af854a3a-2127-422b-91ae-364da2661108https://raw.githubusercontent.com/reidmefirst/vuln-disclosure/main/2021-02.txt

Weakness Classification(1)

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

CWE-120Buffer Copy without Checking Size (Classic Buffer Overflow)

Data Freshness Timeline

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

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 09:18 UTCEG score recompute
2026-05-26 09:18 UTCGHSA enrichment
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2021-35977?

CVE-2021-35977 is a critical vulnerability published on October 8, 2021. An issue was discovered in Digi RealPort for Windows through 4.8.488.0. A buffer overflow exists in the handling of ADDP discovery response messages. This could result in arbitrary code execution.

When was CVE-2021-35977 disclosed?

CVE-2021-35977 was first published in the National Vulnerability Database on October 8, 2021, 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-2021-35977 actively exploited?

CVE-2021-35977 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 77.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-35977?

CVE-2021-35977 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2021-35977?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-35977, 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.

Dependency Blast Radius

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CVE-2021-35977

📅 Published

🔄 Last Modified

🔗 References (2)