{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-15661", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-06-18T20:12:38.095Z", "datePublished": "2026-06-18T20:18:29.475Z", "dateUpdated": "2026-07-14T22:25:35.894Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-07-14T22:25:35.894Z" }, "title": "libssh2 - Heap Buffer Over-read via sftp_symlink() in sftp.c", "descriptions": [ { "lang": "en", "value": "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." } ], "tags": [ "x_open-source" ], "datePublic": "2025-10-06T00:00:00.000Z", "problemTypes": [ { "descriptions": [ { "lang": "en", "cweId": "CWE-125", "description": "Out-of-bounds Read", "type": "CWE" } ] } ], "affected": [ { "defaultStatus": "affected", "packageURL": "pkg:github/libssh2/libssh2", "vendor": "libssh2", "product": "libssh2", "repo": "https://github.com/libssh2/libssh2", "versions": [ { "status": "affected", "version": "0", "versionType": "semver", "lessThanOrEqual": "1.11.1" }, { "status": "unaffected", "version": "2dae3024897e1898d389835151f4e9606227721d", "versionType": "git" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:a:libssh2:libssh2:*:*:*:*:*:*:*:*", "versionEndIncluding": "1.11.1" } ] } ] } ], "metrics": [ { "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ], "cvssV4_0": { "attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 8.3, "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N" } }, { "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ], "cvssV3_1": { "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "version": "3.1", "baseSeverity": "MEDIUM", "baseScore": 6.5, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H" } } ], "references": [ { "url": "https://github.com/libssh2/libssh2/pull/1705", "name": "Researcher Pull Request", "tags": [ "issue-tracking" ] }, { "url": "https://github.com/libssh2/libssh2/pull/1717", "name": "Maintainer Pull Request", "tags": [ "issue-tracking" ] }, { "url": "https://github.com/libssh2/libssh2/commit/2dae3024897e1898d389835151f4e9606227721d", "name": "Patch Commit", "tags": [ "patch" ] }, { "url": "https://www.vulncheck.com/advisories/libssh2-heap-buffer-over-read-via-sftp-symlink-in-sftp-c", "tags": [ "third-party-advisory" ] } ], "credits": [ { "lang": "en", "value": "Joshua Rogers", "type": "finder" }, { "lang": "en", "value": "Tristan Madani (@TristanInSec)", "type": "reporter" } ], "source": { "discovery": "UNKNOWN" }, "x_generator": { "engine": "vulncheck" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-06-22T18:07:05.411976Z", "id": "CVE-2025-15661", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-22T18:07:10.941Z" } } ] } }