hfiref0x LightFTP up to 2.4 ftpserv.c race condition

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.2$0-$5k2.31

Summaryinfo

A vulnerability classified as critical has been found in hfiref0x LightFTP up to 2.4. This issue affects some unknown processing of the file ftpserv.c. This manipulation causes race condition. This vulnerability is registered as CVE-2026-70637. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in hfiref0x LightFTP up to 2.4. It has been declared as critical. Affected by this vulnerability is some unknown processing of the file ftpserv.c. The manipulation with an unknown input leads to a race condition vulnerability. The CWE definition for the vulnerability is CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. As an impact it is known to affect integrity, and availability. The summary by CVE is:

LightFTP through 2.4 contains multiple data race vulnerabilities in ftpserv.c that allow anonymous attackers to cause undefined behavior by issuing LIST followed by ABOR commands without authentication. The control thread closes data_socket and file_fd descriptors while worker threads concurrently operate on the same fields in worker_thread_cleanup, allowing stale file descriptors to be reassigned by the OS and subsequently used by worker threads on unrelated resources, resulting in potential denial of service.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-70637 since 08/04/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

Applying the patch d28c5e08aa4bd128737d35cc6ee0f9630a910ed5 is able to eliminate this problem.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-53933). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: d28c5e08aa4bd128737d35cc6ee0f9630a910ed5

Timelineinfo

08/04/2026 CVE reserved
08/06/2026 +2 days Advisory disclosed
08/06/2026 +0 days VulDB entry created
08/06/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-70637 (🔒)
GCVE (CVE): GCVE-0-2026-70637
GCVE (VulDB): GCVE-100-386665
EUVD: 🔒

Entryinfo

Created: 08/06/2026 18:09
Updated: 08/06/2026 19:00
Changes: 08/06/2026 18:09 (55), 08/06/2026 19:00 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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