CVE-2019-3855 json
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…
published 7y ago modified 26d ago also EUVD-2019-13469
- cvss
- 7.5
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 9.3%
- EPSS 9.3% chance of exploitation in 30 days, percentile 95%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
- Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP V3.1.5
- Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
- libssh2 Debian 14, Debian 13, Debian 12 1.8.0-2.1
debian advisories DEBIAN-CVE-2019-3855
- libssh2 Ubuntu Pro 14.04 LTS 1.4.3-2ubuntu0.2+esm1
- libssh2 Ubuntu Pro 16.04 LTS 1.5.0-2ubuntu0.1+esm1
ubuntu advisories UBUNTU-CVE-2019-3855
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- SLOF RHEL 8 20171214-5.gitfa98132.module+el8.0.0+3075+09be6b65
- hivex RHEL 8 1.3.15-6.module+el8.0.0+3075+09be6b65
- netcf RHEL 8 0.2.8-10.module+el8.0.0+3075+09be6b65
- nbdkit RHEL 8 1.4.2-4.module+el8.0.0+3075+09be6b65
- libssh2 RHEL 8 1.8.0-7.module+el8.0.0+3075+09be6b65.1
- libvirt RHEL 8 4.5.0-23.1.module+el8.0.0+3151+3ba813f9
- seabios RHEL 8 1.11.1-3.module+el8.0.0+3075+09be6b65
- sgabios RHEL 8 1:0.20170427git-2.module+el8.0.0+3075+09be6b65
red hat advisories RHSA-2019:1175RHSA-2019:2399RHSA-2019:1943RHSA-2019:1652RHSA-2019:1791RHSA-2019:0679
- libssh2_org SLES for SAP 15, SLES 15-LTSS, SLE Module for Basesystem 15 SP2 +3 more 1.9.0-4.13.1
- libssh2_org SLE Point of Sale 11 SP3 1.2.9-4.2.12.5.1
- libssh2_org SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES for SAP 12 SP2 +13 more 1.4.3-20.3.1
- libssh2_org SLES for SAP 11 SP4, SLES 11 SP4, SLE Software Development Kit 11 SP4 1.4.3-17.3.1
suse advisories SUSE-SU-2020:3551-1SUSE-SU-2019:13997-1SUSE-SU-2019:0655-1SUSE-SU-2019:13982-1
- libssh2_org openSUSE Tumbleweed 1.9.0-3.6
- libssh2_org openSUSE Leap 15.2 1.9.0-lp152.8.3.1
- libssh2_org openSUSE Leap 15.1 1.9.0-lp151.6.6.1
- libssh2_org openSUSE Leap 15.0 1.8.0-lp150.3.3.1
opensuse advisories openSUSE-SU-2024:10999-1openSUSE-SU-2020:2129-1openSUSE-SU-2020:2126-1openSUSE-SU-2019:1109-1
- libssh2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +13 more 1.8.1-r0
alpine advisories ALPINE-CVE-2019-3855
Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- libssh2 Arch Linux 1.8.1-1
arch linux advisories AVG-926
Is CVE-2019-3855 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerVendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2019-3855 updated cvss 7.5
libssh2: Integer overflow in transport read resulting in out of bounds write
-
Red Hat Enterprise Linux 8 Advanced Virtualization libssh2affected: no fix available
-
Red Hat Virtualization 4 rhvm-appliance, redhat-virtualization-host-image-updateaffected: no fix planned “Will not fix”
-
Red Hat Enterprise Linux AppStream (v. 8) hivex 1.3.15-6.module+el8.0.0+3075+09be6b65, nbdkit 1.4.2-4.module+el8.0.0+3075+09be6b65, netcf 0.2.8-10.module+el8.0.0+3075+09be6b65, seabios 1.11.1-3.module+el8.0.0+3075+09be6b65, libiscsi 1.18.0-6.module+el8.0.0+3075+09be6b65, libssh2 1.8.0-7.module+el8.0.0+3075+09be6b65.1, +82 morefixed: vendor fix RHSA-2019:1175
-
Red Hat Enterprise Linux Client (v. 7) libssh2 1.4.3-12.el7_6.2 Red Hat Enterprise Linux Client Optional (v. 7) libssh2-docs 1.4.3-12.el7_6.2, libssh2-devel 1.4.3-12.el7_6.2, libssh2-debuginfo 1.4.3-12.el7_6.2 Red Hat Enterprise Linux ComputeNode (v. 7) libssh2 1.4.3-12.el7_6.2fixed: vendor fix RHSA-2019:0679
-
Red Hat Enterprise Linux ComputeNode EUS (v. 7.4) libssh2 1.4.3-11.el7_4.1fixed: vendor fix RHSA-2019:1943
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Red Hat Enterprise Linux ComputeNode EUS (v. 7.5) libssh2 1.4.3-11.el7_5.1fixed: vendor fix RHSA-2019:1791
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Red Hat Enterprise Linux ComputeNode Optional (v. 7) libssh2-docs 1.4.3-12.el7_6.2, libssh2-devel 1.4.3-12.el7_6.2, libssh2-debuginfo 1.4.3-12.el7_6.2fixed: vendor fix RHSA-2019:0679
-
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4) libssh2-docs 1.4.3-11.el7_4.1, libssh2-devel 1.4.3-11.el7_4.1, libssh2-debuginfo 1.4.3-11.el7_4.1fixed: vendor fix RHSA-2019:1943
show 18 moreshow fewer
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Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.5) libssh2-docs 1.4.3-11.el7_5.1, libssh2-devel 1.4.3-11.el7_5.1, libssh2-debuginfo 1.4.3-11.el7_5.1fixed: vendor fix RHSA-2019:1791
-
Red Hat Enterprise Linux Desktop (v. 6) libssh2 1.4.2-3.el6_10.1 Red Hat Enterprise Linux Desktop Optional (v. 6) libssh2-docs 1.4.2-3.el6_10.1, libssh2-devel 1.4.2-3.el6_10.1, libssh2-debuginfo 1.4.2-3.el6_10.1fixed: vendor fix RHSA-2019:1652
-
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) libssh2 1.4.3-12.el7_6.2 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) libssh2-docs 1.4.3-12.el7_6.2, libssh2-devel 1.4.3-12.el7_6.2, libssh2-debuginfo 1.4.3-12.el7_6.2fixed: vendor fix RHSA-2019:0679
-
Red Hat Enterprise Linux HPC Node (v. 6) libssh2 1.4.2-3.el6_10.1 Red Hat Enterprise Linux HPC Node Optional (v. 6) libssh2-docs 1.4.2-3.el6_10.1, libssh2-devel 1.4.2-3.el6_10.1, libssh2-debuginfo 1.4.2-3.el6_10.1 Red Hat Enterprise Linux Server (v. 6) libssh2 1.4.2-3.el6_10.1fixed: vendor fix RHSA-2019:1652
-
Red Hat Enterprise Linux Server (v. 7) libssh2 1.4.3-12.el7_6.2fixed: vendor fix RHSA-2019:0679
-
Red Hat Enterprise Linux Server AUS (v. 7.3) libssh2 1.4.3-11.el7_3.1 Red Hat Enterprise Linux Server E4S (v. 7.3) libssh2 1.4.3-11.el7_3.1fixed: vendor fix RHSA-2019:2399
-
Red Hat Enterprise Linux Server EUS (v. 7.4) libssh2 1.4.3-11.el7_4.1fixed: vendor fix RHSA-2019:1943
-
Red Hat Enterprise Linux Server EUS (v. 7.5) libssh2 1.4.3-11.el7_5.1fixed: vendor fix RHSA-2019:1791
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Red Hat Enterprise Linux Server Optional (v. 6) libssh2-docs 1.4.2-3.el6_10.1, libssh2-devel 1.4.2-3.el6_10.1, libssh2-debuginfo 1.4.2-3.el6_10.1fixed: vendor fix RHSA-2019:1652
-
Red Hat Enterprise Linux Server Optional (v. 7) libssh2-docs 1.4.3-12.el7_6.2, libssh2-devel 1.4.3-12.el7_6.2, libssh2-debuginfo 1.4.3-12.el7_6.2fixed: vendor fix RHSA-2019:0679
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Red Hat Enterprise Linux Server Optional AUS (v. 7.3) libssh2-docs 1.4.3-11.el7_3.1, libssh2-devel 1.4.3-11.el7_3.1, libssh2-debuginfo 1.4.3-11.el7_3.1 Red Hat Enterprise Linux Server Optional E4S (v. 7.3) libssh2-docs 1.4.3-11.el7_3.1, libssh2-devel 1.4.3-11.el7_3.1, libssh2-debuginfo 1.4.3-11.el7_3.1fixed: vendor fix RHSA-2019:2399
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Red Hat Enterprise Linux Server Optional EUS (v. 7.4) libssh2-docs 1.4.3-11.el7_4.1, libssh2-devel 1.4.3-11.el7_4.1, libssh2-debuginfo 1.4.3-11.el7_4.1fixed: vendor fix RHSA-2019:1943
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Red Hat Enterprise Linux Server Optional EUS (v. 7.5) libssh2-docs 1.4.3-11.el7_5.1, libssh2-devel 1.4.3-11.el7_5.1, libssh2-debuginfo 1.4.3-11.el7_5.1fixed: vendor fix RHSA-2019:1791
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Red Hat Enterprise Linux Server Optional TUS (v. 7.3) libssh2-docs 1.4.3-11.el7_3.1, libssh2-devel 1.4.3-11.el7_3.1, libssh2-debuginfo 1.4.3-11.el7_3.1 Red Hat Enterprise Linux Server TUS (v. 7.3) libssh2 1.4.3-11.el7_3.1fixed: vendor fix RHSA-2019:2399
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Red Hat Enterprise Linux Workstation (v. 6) libssh2 1.4.2-3.el6_10.1fixed: vendor fix RHSA-2019:1652
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Red Hat Enterprise Linux Workstation (v. 7) libssh2 1.4.3-12.el7_6.2fixed: vendor fix RHSA-2019:0679
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Red Hat Enterprise Linux Workstation Optional (v. 6) libssh2-docs 1.4.2-3.el6_10.1, libssh2-devel 1.4.2-3.el6_10.1, libssh2-debuginfo 1.4.2-3.el6_10.1fixed: vendor fix RHSA-2019:1652
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Red Hat Enterprise Linux Workstation Optional (v. 7) libssh2-docs 1.4.3-12.el7_6.2, libssh2-devel 1.4.3-12.el7_6.2, libssh2-debuginfo 1.4.3-12.el7_6.2fixed: vendor fix RHSA-2019:0679
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
cisa ICSA-23-348-10 updated cvss 8.8
Siemens SIMATIC S7-1500
-
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.0, < 3.1.5affected: fixed in V3.1.5, mitigation support.industry.siemens.com
Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 10mo ago
Exploit prediction
9.29% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 7.5 | CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 9.3 | AV:N/AC:M/Au:N/C:C/I:C/A:C |
Affected products
- The libssh2 Project libssh2
- Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
- Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
- Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classification
References
-
openwall.com
/lists/oss-security/2019/03/18/3
mailing-list, patch, third-party-advisory
-
libssh2.org
/CVE-2019-3855.html
patch, vendor-advisory
-
bugzilla.redhat.com
/show_bug.cgi?id=CVE-2019-3855
issue-tracking, patch, third-party-advisory
-
oracle.com
/technetwork/security-advisory/cpuoct2019-5072832.html
patch, third-party-advisory
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/XCWEA5ZCLKRDUK62QVVYMFWLWKOPX3LO/
vendor-advisory
-
access.redhat.com
/errata/RHSA-2019:0679
vendor-advisory, third-party-advisory
-
lists.opensuse.org
/opensuse-security-announce/2019-03/msg00040.html
vendor-advisory, mailing-list, third-party-advisory
-
lists.opensuse.org
/opensuse-security-announce/2019-04/msg00003.html
vendor-advisory, third-party-advisory
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/5DK6VO2CEUTAJFYIKWNZKEKYMYR3NO2O/
vendor-advisory
-
debian.org
/security/2019/dsa-4431
vendor-advisory, third-party-advisory
-
access.redhat.com
/errata/RHSA-2019:1175
vendor-advisory, third-party-advisory
-
access.redhat.com
/errata/RHSA-2019:1652
vendor-advisory, third-party-advisory
-
access.redhat.com
/errata/RHSA-2019:1791
vendor-advisory, third-party-advisory
-
access.redhat.com
/errata/RHSA-2019:1943
vendor-advisory, third-party-advisory
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/6LUNHPW64IGCASZ4JQ2J5KDXNZN53DWW/
vendor-advisory
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/M7IF3LNHOA75O4WZWIHJLIRMA5LJUED3/
vendor-advisory
-
access.redhat.com
/errata/RHSA-2019:2399
vendor-advisory, third-party-advisory
-
seclists.org
/bugtraq/2019/Mar/25
mailing-list, third-party-advisory
-
packetstormsecurity.com
/files/152136/Slackware-Security-Advisory-libssh2-Updates.html
third-party-advisory, vdb-entry
-
securityfocus.com
/bid/107485
vdb-entry, third-party-advisory
-
broadcom.com
/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2019-767
third-party-advisory
-
lists.debian.org
/debian-lts-announce/2019/03/msg00032.html
mailing-list, third-party-advisory
-
security.netapp.com
/advisory/ntap-20190327-0005/
third-party-advisory
-
seclists.org
/bugtraq/2019/Apr/25
mailing-list, third-party-advisory
-
support.apple.com
/kb/HT210609
third-party-advisory
-
seclists.org
/bugtraq/2019/Sep/49
mailing-list, third-party-advisory
-
seclists.org
/fulldisclosure/2019/Sep/42
mailing-list, third-party-advisory
- cert-portal.siemens.com /productcert/html/ssa-398330.html
Sources
- CVE List CVE-2019-3855
- NVD CVE-2019-3855
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.