CVE-2020-9498Apache Guacamole 1.1.0 and older may mishandle pointers involved inprocessing data received via RDP static virtual channels. If a…
- 6.7MediumCVSS base score
- 0.74%Exploitation in 30 daysEPSS · top 45% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By apache
- 4 months later
· 4 months later
Published
- 4 years later
· 4 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium6.7 | CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.74% · top 45% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.7.
Affected products
Apache Guacamole
- affected Apache Guacamole 1.1.0 and older
References
References9
- https://lists.apache.org/thread.html/rff824b38ebd2fddc726b816f0e509696b83b9f78979d0cd021ca623b%40%3Cannounce.guacamole.apache.org%3E (opens in a new tab)x_refsource_MISCx_transferred
- [announce] 20200701 [SECURITY] CVE-2020-9498: Apache Guacamole: Dangling pointer in RDP static virtual channel handling (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- https://research.checkpoint.com/2020/apache-guacamole-rce/ (opens in a new tab)x_refsource_MISCx_transferred
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44525 (opens in a new tab)x_refsource_CONFIRMx_transferred
- [debian-lts-announce] 20201106 [SECURITY] [DLA 2435-1] guacamole-server security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- FEDORA-2020-bfde0ab889 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- FEDORA-2020-640645e518 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- [announce] 20210125 Apache Software Foundation Security Report: 2020 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [announce] 20210223 Re: Apache Software Foundation Security Report: 2020 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2020-30304 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2020-9498)Record last updated .