Out-of-bounds write in Apache Guacamole
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- High
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Apache Guacamole | Apache Guacamole 1.1.0 and older | — | No fix listed | CNA |
- Apache Guacamole Vendor— Affected Apache Guacamole 1.1.0 and older Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:apache:guacamole:*:*:*:*:*:*:*:* | up to 1.1.0 | Vulnerable | Apache |
| cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* | 32 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* | 33 | Vulnerable | Fedoraproject |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Debian |
- cpe:2.3:a:apache:guacamole:*:*:*:*:*:*:*:* Versions up to 1.1.0 Vulnerable ·Apache
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* Versions 32 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Versions 33 Vulnerable ·Fedoraproject
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
Remediation
No fixed version listed by the sources yet.
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
Apache Guacamole — FEDORA-2020-bfde0ab889
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2020-07606 Improper input validation in Apache GuacamolePriority LOW 22
- Advisory ·
Apache Guacamole — FEDORA-2020-640645e518
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2020-07606 Improper input validation in Apache GuacamolePriority LOW 22
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2020-9498
- 2026-10-03 Alias added: GHSA-wrfm-qjwf-qpwj
References
Advisory 6
- https://lists.apache.org/thread.html/rff824b38ebd2fddc726b816f0e509696b83b9f78979d0cd021ca623b%40%3Cannounce.guacamole.apache.org%3E
- https://research.checkpoint.com/2020/apache-guacamole-rce/
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44525
- [debian-lts-announce] 20201106 [SECURITY] [DLA 2435-1] guacamole-server security update
- FEDORA-2020-bfde0ab889
- FEDORA-2020-640645e518
Sources
- CVE-2020-9498 · CVE Program
- CVE-2020-9498 · NVD
- FIRST EPSS
- GHSA-wrfm-qjwf-qpwj · GitHub Advisory Database · CC BY 4.0
- CVE-2020-9498 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences