How severe is CVE-2019-17069?

CVE-2019-17069 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2019-17069 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-17069?

CVE-2019-17069 primarily affects Putty. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-17069?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-17069 published?

CVE-2019-17069 was published on 2019-10-01 and last updated on 2026-06-17.

CVE-2019-17069

CVE-2019-17069 is a high-severity vulnerability in Putty with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-416.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-416
Affected product: Putty
Published: 2019-10-01
Last modified: 2026-06-17

Description

PuTTY before 0.73 might allow remote SSH-1 servers to cause a denial of service by accessing freed memory locations via an SSH1_MSG_DISCONNECT message.

Frequently asked questions

What is CVE-2019-17069?: PuTTY before 0.73 might allow remote SSH-1 servers to cause a denial of service by accessing freed memory locations via an SSH1_MSG_DISCONNECT message.
How severe is CVE-2019-17069?: CVE-2019-17069 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2019-17069 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-17069?: CVE-2019-17069 primarily affects Putty. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-17069?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-17069 published?: CVE-2019-17069 was published on 2019-10-01 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:a:putty:putty:*:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
cpe:2.3:a:netapp:oncommand_unified_manager_core_package:-:*:*:*:*:*:*:*

More vulnerabilities in Putty

CVE-2004-1008 — Critical (CVSS 10.0): Integer signedness error in the ssh2_rdpkt function in PuTTY before 0.56 allows remote attackers to execute arbitrary…
CVE-2002-1357 — Critical (CVSS 10.0): Multiple SSH2 servers and clients do not properly handle packets or data elements with incorrect length specifiers,…
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CVE-2002-1360 — Critical (CVSS 10.0): Multiple SSH2 servers and clients do not properly handle strings with null characters in them when the string length is…
CVE-2002-1359 — Critical (CVSS 10.0): Multiple SSH2 servers and clients do not properly handle large packets or large fields, which may allow remote…
CVE-2019-17067 — Critical (CVSS 9.8): PuTTY before 0.73 on Windows improperly opens port-forwarding listening sockets, which allows attackers to listen on…

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