CVE-2024-11477 | 7-Zip Zstandard Decompression Integer Underflow Remote Code Execution Vulnerability

7-Zip Zstandard Decompression Integer Underflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of 7-Zip. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation. The specific flaw exists within the implementation of Zstandard decompression. The issue results from the lack of proper validation of user-supplied data, which can result in an integer underflow before writing to memory. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-24346.

Published: 2024-11-22 Last update: 2025-02-15 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-11477 is rated Moderate Risk (60.3/100): CVSS High severity, with high exploitation likelihood (EPSS 21.98%, 97th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. 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.

Exploit prediction scoring system (EPSS) score for CVE-2024-11477

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 43.64% 21.98% -21.65%
2 2026-06-11 44.23% 43.64% -0.59%
3 2026-05-29 — 44.23% —

Full EPSS history (25 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-11477

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.8 3.1 HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]
7.8 3.0 HIGH
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 5.9 [email protected]

Weakness enumeration for CVE-2024-11477

OS Trackers for CVE-2024-11477

vendor priority summary link
alpine high CVE-2024-11477: 2 source package rows (qt5-qtwebengine, qt6-qtwebengine); 5 state rows across 3 repos (3.21-community, 3.22-community, edge-community); fixed 5, open 0. https://security.alpinelinux.org/vuln/CVE-2024-11477
debian unimportant CVE-2024-11477 unimportant 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-2024-11477
suse high CVE-2024-11477 severity important: SUSE including 13 source package names (libQt5Pdf5-5.15.19-1.1, libQt5PdfWidgets5-5.15.19-1.1, …), 72 product×package rows across 36 product lines (SLES-LTSS-TERADATA 15 SP2, SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS, … (36 product lines)): Known Not Affected 62, Fixed 10. https://www.suse.com/security/cve/CVE-2024-11477/
ubuntu medium CVE-2024-11477 medium priority: Ubuntu including 2 source packages (7zip, p7zip), 17 status rows across 10 suites (bionic, focal, jammy, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 9, needs-triage 5, released 2, DNE 1. https://ubuntu.com/security/CVE-2024-11477

Affected software / configurations for CVE-2024-11477

Vendor Product Version Raw CPE
7-zip 7-zip < 24.07 cpe:2.3:a:7-zip:7-zip:*:*:*:*:*:*:*:*

References for CVE-2024-11477

cvelogic Threat Intelligence