How severe is CVE-2025-5449?

CVE-2025-5449 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-5449 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-5449?

CVE-2025-5449 primarily affects Libssh. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-5449?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-5449 have an EU (EUVD) identifier?

Yes. CVE-2025-5449 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-22738.

When was CVE-2025-5449 published?

CVE-2025-5449 was published on 2025-07-25 and last updated on 2026-06-30.

CVE-2025-5449

CVE-2025-5449 is a medium-severity vulnerability in Libssh with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-190.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-22738
Weakness: CWE-190
Affected product: Libssh
Published: 2025-07-25
Last modified: 2026-06-30

Description

A flaw was found in the SFTP server message decoding logic of libssh. The issue occurs due to an incorrect packet length check that allows an integer overflow when handling large payload sizes on 32-bit systems. This issue leads to failed memory allocation and causes the server process to crash, resulting in a denial of service.

Frequently asked questions

What is CVE-2025-5449?: A flaw was found in the SFTP server message decoding logic of libssh. The issue occurs due to an incorrect packet length check that allows an integer overflow when handling large payload sizes on 32-bit systems. This issue leads to failed memory allocation and causes the server process to crash, resulting in a denial of service.
How severe is CVE-2025-5449?: CVE-2025-5449 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-5449 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-5449?: CVE-2025-5449 primarily affects Libssh. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-5449?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-5449 have an EU (EUVD) identifier?: Yes. CVE-2025-5449 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-22738.
When was CVE-2025-5449 published?: CVE-2025-5449 was published on 2025-07-25 and last updated on 2026-06-30.

References

Affected products (2)

cpe:2.3:a:libssh:libssh:0.11.0:*:*:*:*:*:*:*
cpe:2.3:a:libssh:libssh:0.11.1:*:*:*:*:*:*:*

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