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Highest advisory severityHigh 2 vendors · 2 advisories

CVE-2025-15661

Libssh2 Vulnerability in NetApp Products

CVE-2025-15661: Libssh2 Vulnerability in NetApp Products. Not in the CISA KEV catalog. High advisory severity (CVSS 8.3, NetApp).

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

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CVE-2025-15661 key facts

CISA KEV
Not listed (catalog checked )
Highest advisory severity
High
CVSS base score
8.3 (NetApp), 6.5 (Red Hat)
CVSS vector
  • CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H (Red Hat)
Weakness
CWE-125
Fixed releases
  • Red Hat: 1.11.1, libssh2-main-1.11.1-9.hum1, RHSA-2026:30132
Vendor advisories
2 from NetApp, Red Hat
VulniPulse record
Published · Updated

Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2025-15661; bulletin-wide values are not repeated here.

Is CVE-2025-15661 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2025-15661 is not in the CISA KEV catalog (checked ) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2025-15661?

Upgrade to a fixed release named by the vendor:

  • Red Hat: 1.11.1, libssh2-main-1.11.1-9.hum1, RHSA-2026:30132
  • Implement strict network egress filtering to allow outbound SSH/SFTP traffic only to known, trusted endpoints. Additionally, enforce strict SSH host key checking in your libssh2 client applications to reject unknown servers and prevent Man-in-the-Middle (MitM) attacks. (Red Hat)

Vendor advisory comparison

NetApp

1 advisory
  • Advisory severityHigh8.3

    High [CVE-2025-15661] Libssh2 Vulnerability in NetApp Products

    NTAP-20260703-0019Source published Source updated

    Libssh2 versions through 1.11.1 are susceptible to a vulnerability which when successfully exploited could lead to disclosure of sensitive information or Denial of Service (DoS). Affected products: Active IQ Unified Manager for VMware vSphere. NetApp reports that one or more additional products remain under investigation; review the canonical advisory for current status. NetApp states there is no workaround available at this time.

    Affected products in this advisory
    • Active IQ Unified Manager for VMware vSphere
    Source-reported affected versions
    • 1.11.1
    Source-reported fixed versions
    No fixed-version detail extracted. This does not mean no fix exists.
    Mitigation guidance
    No mitigation guidance extracted; consult the source.
    Full advisory and evidenceOpen source bulletin

Red Hat

1 advisory
  • Advisory severityMedium6.5

    Medium [CVE-2025-15661] Information disclosure and denial of service via crafted SFTP response

    CVE-2025-15661Source published Source updated

    libssh2 through 1.11.1, fixed in commit 2dae302, contains an out-of-bounds heap read vulnerability in the sftp_symlink() function in src/sftp.c that allows a malicious SSH server or man-in-the-middle attacker to disclose heap memory contents or cause a crash by sending a crafted SSH_FXP_NAME response. Attackers can supply a link_len value larger than the actual packet data in SSH_FXP_NAME responses for SFTP READLINK and REALPATH operations, triggering a heap buffer over-read of up to target_len minus one bytes due to the missing validation of available packet buffer size before the memcpy operation. This can disclose heap memory contents or crash the application, causing a denial of service (DoS). Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H).…

    Affected products in this advisory
    • Red Hat Hardened Images
    • Red Hat Enterprise Linux 6
    • Red Hat Enterprise Linux 7
    • Red Hat package: libssh2
    Source-reported affected versions
    Affected-version details not available in this record.
    Source-reported fixed versions
    • 1.11.1
    • libssh2-main-1.11.1-9.hum1
    • RHSA-2026:30132
    Mitigation guidance
    • Implement strict network egress filtering to allow outbound SSH/SFTP traffic only to known, trusted endpoints. Additionally, enforce strict SSH host key checking in your libssh2 client applications to reject unknown servers and prevent Man-in-the-Middle (MitM) attacks.
    Full advisory and evidenceOpen source bulletin

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