CVE-2020-9498 json
Apache Guacamole 1.1.0 and older may mishandle pointers involved inprocessing data received via RDP static virtual channels.
published 2020-07-02 6 y ago modified 2026-06-17 4 mo ago also BIT-guacamole-2020-9498 , BIT-guacamole-server-2020-9498 , EUVD-2020-30304
- cvss
- 6.7
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 54%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- bitnami guacamole 1.1.0
- bitnami guacamole-server 1.1.0
- guacamole-server Debian 11 1.3.0-1
debian advisories DEBIAN-CVE-2020-9498
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2020-9498 updated cvss 8.8
guacamole-server: Dangling pointer in RDP static virtual channel handling
-
Red Hat All currently supported Red Hat productsnot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
0.74% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.7 | CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.2 | AV:L/AC:H/Au:N/C:C/I:C/A:C |
| OSV | 3.1 | 6.7 | CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | guacamole | <1.1.0 |
1.1.0 |
| bitnami | guacamole-server | <1.1.0 |
1.1.0 |
Affected products
- n/a Apache Guacamole
Classification
- Weakness
-
- CWE-787 Out-of-bounds Write
References
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/TVV5K2X4EXSAVUUL7IJ3MUJ3ADWMVSBM/
vendor-advisory, web
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/WNS7UHBOFV6JHWH5XOEZTE3BREGRSSQ3/
vendor-advisory, web
-
lists.apache.org
/thread.html/rff824b38ebd2fddc726b816f0e509696b83b9f78979d0cd021ca623b%40%3Cannounce.guacamole.apache.org%3E
mailing-list, third-party-advisory, web
-
lists.apache.org
/thread.html/r26fb170edebff842c74aacdb1333c1338f0e19e5ec7854d72e4680fc%40%3Cannounce.apache.org%3E
mailing-list, web
-
research.checkpoint.com
/2020/apache-guacamole-rce/
third-party-advisory, web
-
kb.pulsesecure.net
/articles/Pulse_Security_Advisories/SA44525
third-party-advisory, web
-
lists.debian.org
/debian-lts-announce/2020/11/msg00010.html
mailing-list, third-party-advisory, web
-
lists.apache.org
/thread.html/r90890afea72a9571d666820b2fe5942a0a5f86be406fa31da3dd0922%40%3Cannounce.apache.org%3E
mailing-list, web
-
lists.apache.org
/thread.html/r1125f3044a0946d1e7e6f125a6170b58d413ebd4a95157e4608041c7%40%3Cannounce.apache.org%3E
mailing-list, web
Sources
- CVE List CVE-2020-9498
- NVD CVE-2020-9498
- OSV BIT-guacamole-2020-9498
- OSV BIT-guacamole-server-2020-9498
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.