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CVE-2019-3855
An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way packets are read…
- 7.5HighCVSS base score
- 9.3%Exploitation in 30 daysEPSS · top 4.6% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way packets are read from the server. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.
Timeline
ID reserved
By redhat
- 3 months later
· 3 months later
Published
- 8 years later
· 8 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| redhatCNA (assigner) | 3.0 | High7.5 | CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 9.3% · top 4.6% of all CVEs (11 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected 1.8.1
References
References28
- [oss-security] 20190318 [SECURITY ADVISORIES] libssh2 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- 20190319 [slackware-security] libssh2 (SSA:2019-077-01) (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- https://www.libssh2.org/CVE-2019-3855.html (opens in a new tab)x_refsource_MISCx_transferred
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3855 (opens in a new tab)x_refsource_CONFIRMx_transferred
- http://packetstormsecurity.com/files/152136/Slackware-Security-Advisory-libssh2-Updates.html (opens in a new tab)x_refsource_MISCx_transferred
- 107485 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- FEDORA-2019-f31c14682f (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2019-767 (opens in a new tab)x_refsource_CONFIRMx_transferred
- [debian-lts-announce] 20190326 [SECURITY] [DLA 1730-1] libssh2 security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- https://security.netapp.com/advisory/ntap-20190327-0005/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- RHSA-2019:0679 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- openSUSE-SU-2019:1075 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- openSUSE-SU-2019:1109 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- FEDORA-2019-3348cb4934 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- DSA-4431 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- 20190415 [SECURITY] [DSA 4431-1] libssh2 security update (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- RHSA-2019:1175 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2019:1652 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2019:1791 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2019:1943 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- FEDORA-2019-9d85600fc7 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- FEDORA-2019-5885663621 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- RHSA-2019:2399 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- https://support.apple.com/kb/HT210609 (opens in a new tab)x_refsource_CONFIRMx_transferred
- 20190927 APPLE-SA-2019-9-26-7 Xcode 11.0 (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- 20190927 APPLE-SA-2019-9-26-7 Xcode 11.0 (opens in a new tab)mailing-listx_refsource_FULLDISCx_transferred
- https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html (opens in a new tab)x_refsource_MISCx_transferred
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2019-13469 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2019-3855)Record last updated .