CVE-2023-43826 json
Apache Guacamole: Integer overflow in handling of VNC image buffers
published 2023-12-19 2 y ago modified 2026-06-17 4 mo ago also BIT-guacamole-2023-43826 , BIT-guacamole-server-2023-43826 , EUVD-2023-48191
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 59%
- public exploits
- 0
- none known
Summary
Apache Guacamole 1.5.3 and older do not consistently ensure that values received from a VNC server will not result in integer overflow. If a user connects to a malicious or compromised VNC server, specially-crafted data could result in memory corruption, possibly allowing arbitrary code to be executed with the privileges of the running guacd process.
Users are recommended to upgrade to version 1.5.4, which fixes this issue.
Patch / fix
- bitnami guacamole 1.5.3
- bitnami guacamole-server 1.5.3
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-2023-43826 updated cvss 7.5
guacamole-server: integer overflow vulnerability
-
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
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 14 mo ago
Exploit prediction
0.89% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| CNA | 3.1 | 7.0 | CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
| CNA | 3.1 | 0.0 | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:N |
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| OSV | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | guacamole | <1.5.3 |
1.5.3 |
| bitnami | guacamole-server | <1.5.3 |
1.5.3 |
Affected products
- Apache Software Foundation Apache Guacamole
Classification
- Weakness
-
- CWE-190 Integer Overflow or Wraparound
References
-
lists.apache.org
/thread/23gzwftpfgtq97tj6ttmbclry53kmwv6
vendor-advisory, mailing-list, web
-
openwall.com
/lists/oss-security/2023/12/19/4
mailing-list, third-party-advisory, web
Sources
- CVE List CVE-2023-43826
- NVD CVE-2023-43826
- OSV BIT-guacamole-2023-43826
- OSV BIT-guacamole-server-2023-43826
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