In libssh2 v1.9.0 and earlier versions, the SSH_MSG_DISCONNECT logic in packet.c has an integer overflow in a bounds check, enabling an atta
In libssh2 v1.9.0 and earlier versions, the SSH_MSG_DISCONNECT logic in packet.c has an integer overflow in a bounds check, enabling an attacker to specify an arbitrary (out-of-bounds) offset for a subsequent memory read. A crafted SSH server may be able to disclose sensitive information or cause a denial of service condition on the client system when a user connects to the server.
- BDU:2022-05961
- DLA-1991-1
- DLA-2848-1
- DLA-3559-1
- openSUSE-SU-2019:2483-1
- openSUSE-SU-2020:2126-1
- openSUSE-SU-2020:2129-1
- openSUSE-SU-2024:10999-1
- RHSA-2020:3915
- SUSE-RU-2023:4066-1
- SUSE-RU-2023:4192-1
- SUSE-SU-2019:14206-1
- SUSE-SU-2019:14226-1
- SUSE-SU-2019:2900-1
- SUSE-SU-2019:2900-2
- SUSE-SU-2019:2936-1
- SUSE-SU-2020:3551-1
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for help- Published
- Oct 21, 2019
- Updated
- Jun 16, 2026
- EPSS
- 3.8% · 90th percentile
- CWE
- CWE-190
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Report tools
Action score
33
Monitor
Low priority for now.
- CVSS
- 32 / 40 · 8.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 3.8%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| libssh2 | libssh2 | cpe:2.3:a:libssh2:libssh2 |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
| opensuse | leap | cpe:2.3:o:opensuse:leap |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| netapp | active iq unified manager | cpe:2.3:a:netapp:active_iq_unified_manager |
| netapp | element software | cpe:2.3:a:netapp:element_software |
| netapp | hci management node | cpe:2.3:a:netapp:hci_management_node |
| netapp | ontap select deploy administration utility | cpe:2.3:a:netapp:ontap_select_deploy_administration_utility |
| netapp | solidfire | cpe:2.3:a:netapp:solidfire |
| netapp | bootstrap os | cpe:2.3:o:netapp:bootstrap_os |
| netapp | hci compute node | cpe:2.3:h:netapp:hci_compute_node |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- debian debian linux8.0
- debian debian linux9.0
- fedoraproject fedora30
- fedoraproject fedora31
- libssh2 libssh2up to 1.9.0 inclusive
- netapp active iq unified managerall versions
- netapp bootstrap osall versions
- netapp element softwareall versions
- netapp hci management nodeall versions
- netapp ontap select deploy administration utilityall versions
- netapp solidfireall versions
- opensuse leap15.1
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.10 | libssh2 | before 1.9.0-r1 | 1.9.0-r1 |
| Debian:10 | libssh2 | before 1.8.0-2.1+deb10u1 | 1.8.0-2.1+deb10u1 |
| Debian:12 | libssh2 | before 1.9.0-1 | 1.9.0-1 |
| Debian:8 | libssh2 | before 1.4.3-4.1+deb8u6 | 1.4.3-4.1+deb8u6 |
| Debian:9 | libssh2 | before 1.7.0-1+deb9u2 | 1.7.0-1+deb9u2 |
| openSUSE:Leap 15.1 | libssh2_org | before 1.9.0-lp151.6.6.1 | 1.9.0-lp151.6.6.1 |
| openSUSE:Leap 15.1 | libssh2_org | before 1.8.0-lp151.6.3.1 | 1.8.0-lp151.6.3.1 |
| openSUSE:Leap 15.2 | libssh2_org | before 1.9.0-lp152.8.3.1 | 1.9.0-lp152.8.3.1 |
| openSUSE:Tumbleweed | libssh2_org | before 1.9.0-3.6 | 1.9.0-3.6 |
| Red Hat:enterprise_linux:7::client | libssh2 | before 0:1.8.0-4.el7 | 0:1.8.0-4.el7 |
| Red Hat:enterprise_linux:7::client | libssh2-debuginfo | before 0:1.8.0-4.el7 | 0:1.8.0-4.el7 |
| Red Hat:enterprise_linux:7::client | libssh2-devel | before 0:1.8.0-4.el7 | 0:1.8.0-4.el7 |
| Red Hat:enterprise_linux:7::client | libssh2-docs | before 0:1.8.0-4.el7 | 0:1.8.0-4.el7 |
| SUSE:HPE Helion OpenStack 8 | libssh2_org | before 1.4.3-20.14.1 | 1.4.3-20.14.1 |
| SUSE:Linux Enterprise Micro 5.3 | libssh2_org | before 1.11.0-150000.4.19.1 | 1.11.0-150000.4.19.1 |
| SUSE:Linux Enterprise Micro 5.3 | libssh2_org | before 1.11.0-150000.4.19.1 | 1.11.0-150000.4.19.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 | libssh2_org | before 1.8.0-4.10.1 | 1.8.0-4.10.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP1 | libssh2_org | before 1.9.0-4.13.1 | 1.9.0-4.13.1 |
| SUSE:Linux Enterprise Point of Sale 11 SP3 | libssh2_org | before 1.2.9-4.2.12.18.1 | 1.2.9-4.2.12.18.1 |
| SUSE:Linux Enterprise Server 11 SP4-LTSS | libssh2_org | before 1.4.3-17.12.1 | 1.4.3-17.12.1 |
| SUSE:Linux Enterprise Software Development Kit 12 SP5 | libssh2_org | before 1.11.0-29.6.1 | 1.11.0-29.6.1 |
Same product
libssh2: all recordsOther highest-scoring records for the same primary product.
- CVE-2019-3861An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the way SSH packets with a padding length value greater than the packet38Monitor
- CVE-2019-3860An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the way SFTP packets with empty payloads are parsed.38Monitor
- CVE-2019-3858An out of bounds read flaw was discovered in libssh2 before 1.8.1 when a specially crafted SFTP packet is received from the server.38Monitor
- CVE-2019-3855An 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 38Monitor
- CVE-2019-3862An 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 and38Monitor
- CVE-2019-3859An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the _libssh2_packet_require and _libssh2_packet_requirev functions.38Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| alpine:libssh2 | 1.9.0-r1 · Alpine:v3.10 | Package registry (OSV) |
| debian:libssh2 | 1.9.0-1 · Debian:12 | Package registry (OSV) |
| opensuse:libssh2_org | 1.11.0-150000.4.19.1 · openSUSE:Leap Micro 5.3 | Package registry (OSV) |
| red hat:libssh2 | 0:1.8.0-4.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:libssh2-debuginfo | 0:1.8.0-4.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:libssh2-devel | 0:1.8.0-4.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:libssh2-docs | 0:1.8.0-4.el7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| suse:libssh2_org | 1.11.0-150000.4.19.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:libssh2_org | 1.11.0-29.6.1 · SUSE:Linux Enterprise Software Development Kit 12 SP5 | Package registry (OSV) |
Exploit status
Proof of concept available
A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.
Evidence
- Proof-of-concept repository on GitHub ×1
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Proof-of-concept repository on GitHub | stars:0 | 2022-10-09 |
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- Published
- First PoC+1083 d
- TodaySep 30, 2026+2536 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- A user must open a link or visit a page.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-190 · Integer Overflow or WraparoundCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- lists.opensuse.org/opensuse-security-announce/2019-11/msg00026.html
- packetstormsecurity.com/files/172835/libssh2-1.9.0-Out-Of-Bounds-Read.html
- blog.semmle.com/libssh2-integer-overflow-CVE-2019-17498/
- github.com/libssh2/libssh2/commit/dedcbd106f8e52d5586b0205bc7677e4c9868f9c
- lists.debian.org/debian-lts-announce/2019/11/msg00010.html
- lists.debian.org/debian-lts-announce/2021/12/msg00013.html
- lists.debian.org/debian-lts-announce/2023/09/msg00006.html
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/22H4Q5XMGS3QNSA7OCL3U7UQZ4NXMR5O/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TY7EEE34RFKCTXTMBQQWWSLXZWSCXNDB/
- security.netapp.com/advisory/ntap-20220909-0004/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.