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NVD / CVE Program· CNA mitre

CVE-2019-17498: 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

Noroxi assessment

Priority: Monitor (action score 33/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 3.8% (FIRST EPSS); higher than 90% of all records.
  • 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.
  • Fixed version: libssh2 (Alpine:v3.10) 1.9.0-r1; libssh2 (Debian:10) 1.8.0-2.1+deb10u1; libssh2 (Debian:12) 1.9.0-1.

Low priority for now. Upgrade to libssh2 (Alpine:v3.10) 1.9.0-r1; libssh2 (Debian:10) 1.8.0-2.1+deb10u1; libssh2 (Debian:12) 1.9.0-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 8.1 · v3.1—Proof of concept Fix available
Published
Oct 21, 2019
Updated
Oct 14, 2026
EPSS
3.8% · 90th percentile

Report tools

JSON

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%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2019-17498

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
libssh2libssh2
fedoraprojectfedora
opensuseleap
debiandebian linux
netappactive iq unified manager
netappelement software
netapphci management node
netappontap select deploy administration utility
netappsolidfire
netappbootstrap os
netapphci 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.

EcosystemPackageAffected rangeFix
Alpine:v3.10libssh2before 1.9.0-r11.9.0-r1
Debian:10libssh2before 1.8.0-2.1+deb10u11.8.0-2.1+deb10u1
Debian:12libssh2before 1.9.0-11.9.0-1
Debian:8libssh2before 1.4.3-4.1+deb8u61.4.3-4.1+deb8u6
Debian:9libssh2before 1.7.0-1+deb9u21.7.0-1+deb9u2
openSUSE:Leap 15.1libssh2_orgbefore 1.8.0-lp151.6.3.11.8.0-lp151.6.3.1
openSUSE:Leap 15.1libssh2_orgbefore 1.9.0-lp151.6.6.11.9.0-lp151.6.6.1
openSUSE:Leap 15.2libssh2_orgbefore 1.9.0-lp152.8.3.11.9.0-lp152.8.3.1
openSUSE:Leap Micro 5.3libssh2_orgbefore 1.11.0-150000.4.19.11.11.0-150000.4.19.1
openSUSE:Tumbleweedlibssh2_orgbefore 1.9.0-3.61.9.0-3.6
Red Hat:enterprise_linux:7::clientlibssh2before 0:1.8.0-4.el70:1.8.0-4.el7
Red Hat:enterprise_linux:7::clientlibssh2-debuginfobefore 0:1.8.0-4.el70:1.8.0-4.el7
Red Hat:enterprise_linux:7::clientlibssh2-develbefore 0:1.8.0-4.el70:1.8.0-4.el7
Red Hat:enterprise_linux:7::clientlibssh2-docsbefore 0:1.8.0-4.el70:1.8.0-4.el7
SUSE:HPE Helion OpenStack 8libssh2_orgbefore 1.4.3-20.14.11.4.3-20.14.1
SUSE:Linux Enterprise Micro 5.3libssh2_orgbefore 1.11.0-150000.4.19.11.11.0-150000.4.19.1
SUSE:Linux Enterprise Module for Basesystem 15libssh2_orgbefore 1.8.0-4.10.11.8.0-4.10.1
SUSE:Linux Enterprise Module for Basesystem 15 SP1libssh2_orgbefore 1.9.0-4.13.11.9.0-4.13.1
SUSE:Linux Enterprise Point of Sale 11 SP3libssh2_orgbefore 1.2.9-4.2.12.18.11.2.9-4.2.12.18.1
SUSE:Linux Enterprise Server 11 SP4-LTSSlibssh2_orgbefore 1.4.3-17.12.11.4.3-17.12.1
SUSE:Linux Enterprise Software Development Kit 12 SP5libssh2_orgbefore 1.11.0-29.6.11.11.0-29.6.1

Same product

libssh2: all records

Other 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 packet
    38Monitor
  • 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

Published before and after this one in the same product

  • ← EarlierCVE-2019-3857Mar 25, 2019 · An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way SSH_MSG_CHANNEL_REQUES
    37Monitor
  • ← EarlierCVE-2019-13115Jul 16, 2019 · In libssh2 before 1.9.0, kex_method_diffie_hellman_group_exchange_sha256_key_exchange in kex.c has an integer overflow that could lead to an
    35Monitor
  • Later →CVE-2020-22218Aug 22, 2023 · An issue was discovered in function _libssh2_packet_add in libssh2 1.10.0 allows attackers to access out of bounds memory.
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:libssh21.9.0-r1 · Alpine:v3.10Package registry (OSV)
debian:libssh21.9.0-1 · Debian:12Package registry (OSV)
opensuse:libssh2_org1.11.0-150000.4.19.1 · openSUSE:Leap Micro 5.3Package registry (OSV)
red hat:libssh20:1.8.0-4.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:libssh2-debuginfo0:1.8.0-4.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:libssh2-devel0:1.8.0-4.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
red hat:libssh2-docs0:1.8.0-4.el7 · Red Hat:enterprise_linux:7::clientPackage registry (OSV)
suse:libssh2_org1.11.0-150000.4.19.1 · SUSE:Linux Enterprise Micro 5.3Package registry (OSV)
suse:libssh2_org1.11.0-29.6.1 · SUSE:Linux Enterprise Software Development Kit 12 SP5Package 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.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:02022-10-09

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.

  1. Published
  2. First PoC+1083 d
  3. TodayOct 31, 2026+2567 d

No history yet (it accumulates with the daily EPSS job).

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 researchers

Finders, 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 Wraparound

CVSS 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.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (10 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records