CVE-2019-3862: debian debian_linux
Vulnerability summary
CVE-2019-3862 is a critical (CVSS 9.1) vulnerability in debian debian_linux. EPSS estimates a 7.90% chance of exploitation in the next 30 days, higher than 94.7% of scored vulnerabilities.
Severe, CVSS 7.3 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 8% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 12 · Related 9Timeline
- 20-03-2019PublishedVulnerability first disclosed.
- 14-10-2026Last modifiedVulnerability information updated.
Description
An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the way SSH_MSG_CHANNEL_REQUEST packets with an exit status message and no payload are parsed. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory.
CVSS metrics
7 scores · 6 sources · 2 versions- CVE.orgCNA7.3HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:LDiffers
- OSV · AlpineEcosystem advisory · calculated9.1CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- OSV · Red hatEcosystem advisory · calculated7.3HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:LDiffers
- OSV · UbuntuEcosystem advisory · calculated9.1CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- OSV · DebianEcosystem advisory · calculated9.1CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS trend
Probability
7.90%
Chance of exploitation in the next 30 days
Percentile
95%
Versus all other CVEs
30-day change
No change 0.00 pp
From 7.90% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-130Improper Handling of Length Parameter InconsistencyThe product parses a formatted message or structure, but it does not handle or incorrectly handles a length field that is inconsistent with the actual length of the associated data.
- CWE-125Out-of-bounds ReadThe product reads data past the end, or before the beginning, of the intended buffer.
Affected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat4 products
- libssh2< 0:1.4.3-12.el7_6.3
- libssh2-debuginfo< 0:1.4.3-12.el7_6.3
- libssh2-devel< 0:1.4.3-12.el7_6.3
- libssh2-docs< 0:1.4.3-12.el7_6.3
Debian2 products
- libssh2< 1.8.0-2.1
- debian_linuxEOL8.0
Alpine1 product
- libssh2< 1.8.1-r0
Fedoraproject1 product
- fedoraEOL29
Libssh21 product
- libssh2< 1.8.1
Netapp1 product
Opensuse1 product
- leapEOL42.3
The libssh2 project1 product
- libssh21.8.1
Ubuntu1 product
- libssh2< 1.4.3-2ubuntu0.2+esm2 | < 1.5.0-2ubuntu0.1+esm1 | All versions (No fix recorded)
9 vendors · 13 products
References
31 links- www.openwall.com/lists/oss-security/2019/03/18/3Mailing ListX Refsource MLISTPatchThird Party Advisory
- packetstormsecurity.com/files/152136/Slackware-Security-Advisory-libssh2-Updates.htmlX Refsource MISCPatchThird Party AdvisoryVDB Entry
lists.debian.org/debian-lts-announce/2019/03/msg00032.htmlMailing ListX Refsource MLISTThird Party Advisory
Show all 31 references
- lists.opensuse.org/opensuse-security-announce/2019-03/msg00040.htmlVendor AdvisoryX Refsource SUSEMailing ListThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2019-04/msg00003.htmlVendor AdvisoryX Refsource SUSEThird Party Advisory
- www.oracle.com/security-alerts/cpujan2020.htmlX Refsource MISC
