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CVE-2019-9897
Multiple denial-of-service attacks that can be triggered by writing to the terminal exist in PuTTY versions before 0.71.
- 7.5HighCVSS base score
- 2.9%Exploitation in 30 daysEPSS · top 13% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Multiple denial-of-service attacks that can be triggered by writing to the terminal exist in PuTTY versions before 0.71.
Timeline
ID reserved
By mitre
- 1 day later
· 1 day later
Published
- 5 years later
· 5 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | High7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 2.9% · top 13% of all CVEs (10 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
n/a
- affected n/a
References
9
- https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html (opens in a new tab)x_refsource_MISCx_transferred
- FEDORA-2019-5776dfe300 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- FEDORA-2019-9e1a1cd634 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- openSUSE-SU-2019:1113 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- openSUSE-SU-2019:1123 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- 20190403 [SECURITY] [DSA 4423-1] putty security update (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- https://security.netapp.com/advisory/ntap-20190404-0001/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- DSA-4423 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- [debian-lts-announce] 20190424 [SECURITY] [DLA 1763-1] putty security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2019-19253 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2019-9897)Record last updated .