Vulnerability · CVE-2019-3863
A flaw was found in libssh2 before 1.8.1 creating a vulnerability on the SSH client side.
Published Mar 25, 2019 · catalog updated Oct 14, 2026 · A flaw was found
Check if you run it
No confirmed exploitation is on record for CVE-2019-3863. EPSS is 3.44%. Act only if a listed version of A flaw was found is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (A flaw was found).
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High8.8
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 3.44%
- Remediation
- Advisory link
- Affected products
- cpe debian/debian linux · cpe libssh2/libssh2 · cpe netapp/ontap select deploy administration utility · cpe opensuse/leap · cpe redhat/enterprise linux desktop · cpe redhat/enterprise linux server
A flaw was found in libssh2 before 1.8.1 creating a vulnerability on the SSH client side. A server could send a multiple keyboard interactive response messages whose total length are greater than unsigned char max characters. This value is used by the SSH client as an index to copy memory causing in an out of bounds memory write error.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe debian/debian linux8.0
- cpe libssh2/libssh2version unspecified
- cpe netapp/ontap select deploy administration utilityversion unspecified
- cpe opensuse/leap15.0
- cpe opensuse/leap42.3
- cpe redhat/enterprise linux desktop7.0
- cpe redhat/enterprise linux server7.0
- cpe redhat/enterprise linux server aus7.6
How to fix CVE-2019-3863
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2019-3863. EPSS is 3.44%. Act only if a listed version of A flaw was found is installed.
Which versions are affected?
Compare what you have installed with debian/debian linux 8.0; redhat/enterprise linux desktop 7.0; redhat/enterprise linux server 7.0; redhat/enterprise linux server aus 7.6. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-190: Integer Overflow; CWE-787: Out-of-bounds Write. EPSS 3.44%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Mar 25, 2019 · NIST NVD
Detected
A flaw was found in libssh2 before 1.8.1 creating a vulnerability on the SSH client side. A server could send a multiple keyboard interactive response messages whose total length are greater than unsigned char max characters. This value is used by the SSH client as an index to copy memory causing in an out of bounds memory write error.
Oct 14, 2026 · NIST NVD
Updated
A flaw was found in libssh2 before 1.8.1 creating a vulnerability on the SSH client side. A server could send a multiple keyboard interactive response messages whose total length are greater than unsigned char max characters. This value is used by the SSH client as an index to copy memory causing in an out of bounds memory write error.
Sources
- CVE.orgVulnerability recordCVE-2019-3863
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2019-3863
30-day exploitation probability 3.4%
first.org - NIST NVDVulnerability recordCVE-2019-3863
A flaw was found in libssh2 before 1.8.1 creating a vulnerability on the SSH client side. A server could send a multiple keyboard interactive response messages whose total length are greater than unsigned char max characters. This value is used by the SSH client as an index to co
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.