CVE-2019-9898

Potential recycling of random numbers used in cryptography exists within PuTTY before 0.71.

Published: 2019-03-21 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-9898 is rated High Risk (70.1/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 4.29%). High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2019-9898

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-02-19 4.44% 4.29% -0.15%
2 2025-03-30 3.68% 4.44% +0.76%
3 2025-03-29 — 3.68% —

Full EPSS history (17 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-9898

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2019-9898

OS Trackers for CVE-2019-9898

vendor priority summary link
alpine critical CVE-2019-9898: 1 source package rows (putty); 11 state rows across 11 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-community, 3.21-community, 3.22-community, edge-community, edge-main); fixed 11, open 0. https://security.alpinelinux.org/vuln/CVE-2019-9898
debian not yet assigned CVE-2019-9898 not yet assigned priority: Debian including 1 source packages (putty), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2019-9898
ubuntu medium CVE-2019-9898 medium priority: Ubuntu including 1 source packages (putty), 19 status rows across 19 suites (bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 14, released 2, DNE 1, ignored 1, needs-triage 1. https://ubuntu.com/security/CVE-2019-9898

Affected software / configurations for CVE-2019-9898

Vendor Product Version Raw CPE
putty putty < 0.71 cpe:2.3:a:putty:putty:*:*:*:*:*:*:*:*
fedoraproject fedora 28 cpe:2.3:o:fedoraproject:fedora:28:*:*:*:*:*:*:*
fedoraproject fedora 29 cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
opensuse leap 15.0 cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:*
netapp oncommand_unified_manager — cpe:2.3:a:netapp:oncommand_unified_manager:-:*:*:*:*:*:*:*

References for CVE-2019-9898

URL Tags
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00004.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00020.html Mailing List Third Party Advisory
http://www.securityfocus.com/bid/107523 Third Party Advisory VDB Entry
https://lists.debian.org/debian-lts-announce/2019/04/msg00023.html Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36LWQ3NPFIV7DC7TC4KFPRYRH2OR7SZ2/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LDO3F267P347E6U2IILFCYW7JPTLCCES/
https://seclists.org/bugtraq/2019/Apr/6 Mailing List Third Party Advisory
https://security.netapp.com/advisory/ntap-20190329-0002/ Broken Link
https://security.netapp.com/advisory/ntap-20190401-0002/ Patch Third Party Advisory
https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html Third Party Advisory
https://www.debian.org/security/2019/dsa-4423 Third Party Advisory
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