CVE-2020-9498

MEDIUMNVD 6.76.7—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.7 under NVD CVSS v3. EPSS exploit probability: 0.7%, top 49% 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
6.7EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.7Exploit: None knownExposed: 0

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

Apache Guacamole 1.1.0 and older may mishandle pointers involved inprocessing data received via RDP static virtual channels. If a userconnects to a malicious or compromised RDP server, a series ofspecially-crafted PDUs could result in memory corruption, possiblyallowing arbitrary code to be executed with the privileges of therunning guacd process.

CVSS v3
6.7
EG Score
6.7(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

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
Severity67% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
52%
KEV
Not listed

Published

July 2, 2020

Last Modified

November 21, 2024

References (18)

Affected Packages

(2 across 2 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
guacamole-server—1.3.0-1—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
guacamole-server0.9.9-20.9.9-2+deb9u1—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 29× 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 132 total refreshes for this CVE.

  1. 2026-08-20 17:01 UTCOSV refresh
  2. 2026-08-19 17:00 UTCEPSS rescore
  3. 2026-08-18 13:44 UTCEPSS rescore
  4. 2026-08-17 13:43 UTCEPSS rescore
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  1. 2026-07-24 14:15 UTCEPSS rescore
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  3. 2026-07-23 01:55 UTCEG score recompute
  4. 2026-07-22 22:42 UTCEG score recompute
  5. 2026-07-22 14:05 UTCEPSS rescore
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  12. 2026-07-19 09:52 UTCOSV refresh
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  28. 2026-07-09 19:07 UTCEPSS rescore
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  40. 2026-07-01 15:03 UTCEPSS rescore
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  67. 2026-06-14 23:15 UTCEPSS rescore
  68. 2026-06-13 23:43 UTCOSV refresh
  69. 2026-06-13 22:58 UTCEPSS rescore
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  73. 2026-06-11 13:58 UTCEPSS rescore
  74. 2026-06-11 13:58 UTCEPSS rescore
  75. 2026-06-10 22:16 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2020-9498?
CVE-2020-9498 is a medium vulnerability published on July 2, 2020. Apache Guacamole 1.1.0 and older may mishandle pointers involved inprocessing data received via RDP static virtual channels. If a userconnects to a malicious or compromised RDP server, a series ofspecially-crafted PDUs could result in memory corruption, possiblyallowing arbitrary code to be…
When was CVE-2020-9498 disclosed?
CVE-2020-9498 was first published in the National Vulnerability Database on July 2, 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-2020-9498 actively exploited?
CVE-2020-9498 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 48.2% of all scored CVEs.
What is the CVSS score of CVE-2020-9498?
CVE-2020-9498 has a CVSS v3 base score of 6.7 (NVD).
How do I remediate CVE-2020-9498?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-9498, 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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