TI-2023-03362 Aliases CVE-2023-3603 GHSA-2c4f-vgwr-82q6

Processing sftp server read may cause null dereference

LOW 31CWE-476Published 2023-07-21 · Updated 2024-09-26

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-476.

Summary

A missing allocation check in sftp server processing read requests may cause a NULL dereference on low-memory conditions. The malicious client can request up to 4GB SFTP reads, causing allocation of up to 4GB buffers, which was not being checked for failure. This will likely crash the authenticated user's sftp server connection (if implemented as forking as recommended). For thread-based servers, this might also cause DoS for legitimate users. Given this code is not in any released versions, no security releases have been issued.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00903 59th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	libssh	—	—	No fix listed	CNA
Red Hat	Red Hat Enterprise Linux 7	—	—	Not affected	CNA
Red Hat	Red Hat Enterprise Linux 8	—	—	Not affected	CNA
Red Hat	Red Hat Enterprise Linux 9	—	—	Not affected	CNA
Fedora	Extra Packages for Enterprise Linux 7	—	—	Not affected	CNA
Fedora	Fedora	—	—	Not affected	CNA

libssh Vendor— Affected — Fixed in — No fix listed CNA
Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — Not affected CNA
Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in — Not affected CNA
Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in — Not affected CNA
Extra Packages for Enterprise Linux 7 VendorFedora Affected — Fixed in — Not affected CNA
Fedora VendorFedora Affected — Fixed in — Not affected CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:libssh:libssh::::::::	before 0.8.9	Vulnerable	libssh

cpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:* Versions before 0.8.9 Vulnerable ·libssh

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

Not affected: 3 products

Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9

Timeline

2026-10-02 Threatist record created from CVE-2023-3603
2026-10-03 Alias added: GHSA-2c4f-vgwr-82q6

References

Advisory 2

TI-2019-15875 Protection mechanism failure in Jenkins Pipeline: Groovy Plugin KEVCVSS 3.1CRITICAL 9.9
TI-2019-15874 Protection mechanism failure in Jenkins Script Security Plugin KEVCVSS 3.1CRITICAL 9.9
TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
TI-2019-05363 Code injection in Elastic Kibana KEVCVSS 3.1CRITICAL 10.0
TI-2019-03949 Out-of-bounds write in ESXi and Horizon DaaS KEVCVSS 3.1CRITICAL 9.8
TI-2018-16080 A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153… KEVCVSS 3.1CRITICAL 9.8

See all 7412 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences