CVE-2020-9497 json
Apache Guacamole 1.1.0 and older do not properly validate datareceived from RDP servers via static virtual channels.
published 2020-07-02 6 y ago modified 2026-06-17 4 mo ago also BIT-guacamole-2020-9497 , BIT-guacamole-server-2020-9497 , EUVD-2020-30303
- cvss
- 4.4
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 56%
- public exploits
- 0
- none known
Summary
Apache Guacamole 1.1.0 and older do not properly validate datareceived from RDP servers via static virtual channels. If a userconnects to a malicious or compromised RDP server, specially-craftedPDUs could result in disclosure of information within the memory ofthe guacd process handling the connection.
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-2020-9497
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-2020-9497 updated cvss 6.5
guacamole-server: Improper input validation of RDP static virtual channels
-
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
0.79% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 4.4 | CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 1.2 | AV:L/AC:H/Au:N/C:P/I:N/A:N |
| OSV | 3.1 | 4.4 | CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N |
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-20 Improper Input Validation
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/r65f75d3d65d1af68141f42071ebb27dda24af3e45570e593c1dbd81f%40%3Cannounce.guacamole.apache.org%3E
mailing-list, vendor-advisory, web
-
lists.apache.org
/thread.html/r3f071de70ea1facd3601e0fa894e6cadc960627ee7199437b5a56f7f%40%3Cannounce.apache.org%3E
mailing-list, web
-
lists.apache.org
/thread.html/r066543f0565e97b27c0dfe27e93e8a387b99e1e35764000224ed96e7%40%3Cuser.guacamole.apache.org%3E
mailing-list, web
-
lists.apache.org
/thread.html/r181b1d5b1acb31cfa69f41b2c86ed3a2cb0b5bc09c2cbd31e9e7c847%40%3Cuser.guacamole.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-2020-9497
- NVD CVE-2020-9497
- OSV BIT-guacamole-2020-9497
- OSV BIT-guacamole-server-2020-9497
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.