7.8

CVE-2023-40477: rarlab winrar Improper Validation of Array Index

CVSS: 7.8v3.0HighModified
AliasesMGASA-2023-0258SUSE-SU-2023:4297-1SUSE-SU-2023:4415-1
Published 03-05-2024Last modified 04-11-2025
Open JSON

Vulnerability summary

CVE-2023-40477 is a high (CVSS 7.8) Improper Validation of Array Index vulnerability in rarlab winrar. EPSS estimates a 11.38% chance of exploitation in the next 30 days, higher than 95.9% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.0 (CVE.org)
EPSS score
11.38%
0%100%
Medium · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 3
USN-6569-1USN-7349-1USN-7350-1

Timeline

  1. 03-05-2024
    PublishedVulnerability first disclosed.
  2. 04-11-2025
    Last modifiedVulnerability information updated.

Description

RARLAB WinRAR Recovery Volume Improper Validation of Array Index Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of RARLAB WinRAR. 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 processing of recovery volumes. The issue results from the lack of proper validation of user-supplied data, which can result in a memory access 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-21233.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

11.38%

Chance of exploitation in the next 30 days

Percentile

96%

Versus all other CVEs

30-day change

0.00 pp

From 11.38% on 19-09-2026

19-09-202619-10-2026
EPSS score
11.38%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Suse17 products
  • clamav&distro=SUSE Enterprise Storage 7.1< 0.103.11-150000.3.50.1
  • clamav&distro=SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS< 0.103.11-150000.3.50.1
  • clamav&distro=SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS< 0.103.11-150000.3.50.1
  • clamav&distro=SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS< 0.103.11-150000.3.50.1
  • clamav&distro=SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS< 0.103.11-150000.3.50.1
Debian3 products
  • libclamunrar< 1.0.3-1~deb12u1 | < 1.0.3-1 | < 0.103.10-0+deb10u1
  • rar< 2:6.23-1~deb12u1 | < 2:6.23-1 | < 2:6.23-1~deb10u1
  • unrar-nonfree< 1:6.2.6-1+deb12u1 | < 1:6.2.10-1 | < 1:5.6.6-1+deb10u4
Opensuse3 products
  • clamav&distro=openSUSE Leap 15.4< 0.103.11-150000.3.50.1
  • clamav&distro=openSUSE Leap 15.5< 0.103.11-150000.3.50.1
  • clamav&distro=openSUSE Tumbleweed< 0.103.11-2.1
Ubuntu3 products
  • libclamunrarAll versions (No fix recorded) | < 0.103.11-0ubuntu0.20.04.1 | < 0.103.11-0ubuntu0.22.04.1
  • rarAll versions (No fix recorded) | < 2:6.23-1~20.04.1 | < 2:6.23-1~22.04.1 | < 2:6.23-1
  • unrar-nonfreeAll versions (No fix recorded) | < 1:5.6.6-2ubuntu0.1 | < 1:6.1.5-1ubuntu0.1
Mageia2 products
  • unrar< 6.23-1.mga8.nonfree
  • unrar< 6.23-1.mga9.nonfree
Rarlab1 product

6 vendors · 29 products

References

17 links
Show all 17 references