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CVE-2023-40477· NVD / CVE Program· CNA zdi

RARLAB WinRAR Recovery Volume Improper Validation of Array Index Remote Code Execution Vulnerability

Noroxi assessment

Priority: Monitor (action score 34/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 11.3% (FIRST EPSS); higher than 95.9% of all records.
  • Someone with local access to the system can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: libclamunrar (Debian:10) 0.103.10-0+deb10u1; rar (Debian:10) 2:6.23-1~deb10u1; unrar-nonfree (Debian:10) 1:5.6.6-1+deb10u4.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to libclamunrar (Debian:10) 0.103.10-0+deb10u1; rar (Debian:10) 2:6.23-1~deb10u1; unrar-nonfree (Debian:10) 1:5.6.6-1+deb10u4 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.8 · v3.0—Proof of concept Fix available
Published
May 2, 2024
Updated
Jun 17, 2026
EPSS
11.3% · 95th percentile

Report tools

JSON

Action score

34

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
3 / 30 · 11.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · zdi
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-40477

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
rarlabwinrar

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • rarlab winrarbefore 6.23

Versions reported by the vendor

Affected version ranges reported by the assigning authority (zdi). Independent of NVD's CPE analysis and usually ahead of it.

  • RARLAB WinRAR

    • 6.21affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:10libclamunrarbefore 0.103.10-0+deb10u10.103.10-0+deb10u1
Debian:10rarbefore 2:6.23-1~deb10u12:6.23-1~deb10u1
Debian:10unrar-nonfreebefore 1:5.6.6-1+deb10u41:5.6.6-1+deb10u4
Debian:12libclamunrarbefore 1.0.3-1~deb12u11.0.3-1~deb12u1
Debian:12rarbefore 2:6.23-1~deb12u12:6.23-1~deb12u1
Debian:12unrar-nonfreebefore 1:6.2.6-1+deb12u11:6.2.6-1+deb12u1
Debian:13libclamunrarbefore 1.0.3-11.0.3-1
Debian:13rarbefore 2:6.23-12:6.23-1
Debian:13unrar-nonfreebefore 1:6.2.10-11:6.2.10-1
openSUSE:Tumbleweedclamavbefore 0.103.11-2.10.103.11-2.1
SUSE:Linux Enterprise Module for Basesystem 15 SP4clamavbefore 0.103.11-150000.3.50.10.103.11-150000.3.50.1
SUSE:Linux Enterprise Module for Basesystem 15 SP4clamavbefore 0.103.11-150000.3.50.10.103.11-150000.3.50.1
SUSE:Linux Enterprise Server 12 SP5clamavbefore 0.103.11-3.30.10.103.11-3.30.1

Same product

rarlab: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-8088Path traversal vulnerability in WinRARKEV
    91Now
  • CVE-2023-38831RARLAB WinRAR before 6.23 allows attackers to execute arbitrary code when a user attempts to view a benign file within a ZIP archive.KEV
    91Now
  • CVE-2018-20250In WinRAR versions prior to and including 5.61, There is path traversal vulnerability when crafting the filename field of the ACE format (inKEV
    90Now

Published before and after this one in the same product

  • ← EarlierCVE-2024-30370Apr 2, 2024 · RARLAB WinRAR Mark-Of-The-Web Bypass Vulnerability
    17Monitor
  • ← EarlierCVE-2024-33899Apr 28, 2024 · RARLAB WinRAR before 7.00, on Linux and UNIX platforms, allows attackers to spoof the screen output, or cause a denial of service, via ANSI
    28Monitor
  • Later →CVE-2024-36052May 21, 2024 · RARLAB WinRAR before 7.00, on Windows, allows attackers to spoof the screen output via ANSI escape sequences, a different issue than CVE-202
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:libclamunrar1.0.3-1~deb12u1 · Debian:12Package registry (OSV)
debian:rar2:6.23-1~deb12u1 · Debian:12Package registry (OSV)
debian:unrar-nonfree1:6.2.6-1+deb12u1 · Debian:12Package registry (OSV)
opensuse:clamav0.103.11-150000.3.50.1 · openSUSE:Leap 15.4Package registry (OSV)
suse:clamav0.103.11-150000.3.50.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP4Package registry (OSV)
suse:clamav0.103.11-3.30.1 · SUSE:Linux Enterprise Server 12 SP5Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×2

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02023-08-29
Proof-of-concept repository on GitHubstars:252023-08-29

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-248 d
  2. Published
  3. TodayOct 19, 2026+899 d
EPSS, last 120 days-1% in 7 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-129 · Improper Validation of Array Index

CVSS vector

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records