7-Zip SquashFS File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of 7-Zip. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of SQFS files. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-18589.
Conclusion & alert: CVE-2023-40481 is rated High Risk (70.4/100): CVSS High severity, with high exploitation likelihood (EPSS 26.89%, 98th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +15.08% over the last day, indicating growing attacker interest. Mandatory action: High exploitation likelihood—assess exposure and prioritize remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 11.81% | 26.89% | +15.08% |
| 2 | 2026-06-11 | 10.80% | 11.81% | +1.00% |
| 3 | 2026-05-22 | — | 10.80% | — |
Full EPSS history (17 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 7.8 | 3.0 | HIGH |
|
1.8 | 5.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2023-40481 not yet assigned priority: Debian including 2 source packages (7zip, p7zip), 7 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 7. | https://security-tracker.debian.org/tracker/CVE-2023-40481 |
suse
|
high | CVE-2023-40481 severity important: SUSE including 2 source package names (p7zip, p7zip-full), 47 product×package rows across 33 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 7, … (33 product lines)): Known Not Affected 47. | https://www.suse.com/security/cve/CVE-2023-40481/ |
ubuntu
|
medium | CVE-2023-40481 medium priority: Ubuntu including 1 source packages (7zip), 12 status rows across 12 suites (bionic, focal, jammy, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 5, ignored 4, DNE 1, needs-triage 1, released 1. | https://ubuntu.com/security/CVE-2023-40481 |
| URL | Tags |
|---|---|
| https://sourceforge.net/p/sevenzip/discussion/45797/thread/713c8a8269/ | Product Release Notes |
| https://www.zerodayinitiative.com/advisories/ZDI-23-1164/ | Third Party Advisory |