CVE-2023-33177
Exploitation reported by one source. First attested on 2025-11-17 by GCVE · kevintel.
- Published2023-05-30
- Fixed in3.3.5 · 2.3.17
- WeaknessCWE-22
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
Xibo is a content management system (CMS). A path traversal vulnerability exists in the Xibo CMS whereby a specially crafted zip file can be uploaded to the CMS via the layout import function by an authenticated user which would allow creation of files outside of the CMS library directory as the webserver user. This can be used to upload a PHP webshell inside the web root directory and achieve remote code execution as the webserver user. Users should upgrade to version 2.3.17 or 3.3.5, which fix this issue. Customers who host their CMS with Xibo Signage have already received an upgrade or patch to resolve this issue regardless of the CMS version that they are running.
Timeline
dates in UTC- 2023-05-3020:15CVE publishedNVD
- 2025-11-1715:00Listed as exploited by GCVEGCVE
- 2025-11-1715:00Exploitation first reportedGCVE
- 2026-10-2319:23First public proof of conceptPoC-in-GitHub
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-33177?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-33177?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 3.x | ≥ 3.0.0, < 3.3.5 | 3.3.5 | NVD |
| 2.3 | ≥ 1.8.0, < 2.3.17 | 2.3.17 | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Xibosignage xibo to 3.3.5 · 2.3.17
Advisories and patches
- github.comPatch
- github.comPatch
- github.comPatch · Vendor Advisory
- xibosignage.comVendor Advisory
Detection
read 2026-10-23 19:23 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- 2 repositories, unverifiedcomplexusprada/Xibo-CMS-Zip-Slip-RCE-Exploit-CVE-2023-33177kaxm23/-CVE-2023-33177- PoC-in-GitHub
Sources
- GCVEexploitation2025-11-17
- CISA-ADPSSVC decisionnone2025-01-09
- OpenCVESSVC decisionnone—
- CNACVSS 3.18.8read 2026-10-23
- NVDCVSS 3.18.8read 2026-10-23
- CNAweakness (CWE)CWE-22read 2026-10-23
- NVDweakness (CWE)CWE-22read 2026-10-23
- FIRST EPSSEPSS score7.0 %2026-10-22
- PoC-in-GitHubproof of concept2read 2026-10-23
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Published
- 2023-05-30
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2023-33177?
Is CVE-2023-33177 actively exploited?
What is the CVSS score for CVE-2023-33177?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.