CVE-2004-1440
Multiple heap-based buffer overflows in the modpow function in PuTTY before 0.55 allow (1) remote attackers to execute arbitrary code via…
- 7.5HighCVSS base score
- 4.1%Exploitation in 30 daysEPSS · top 9.1% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Multiple heap-based buffer overflows in the modpow function in PuTTY before 0.55 allow (1) remote attackers to execute arbitrary code via an SSH2 packet with a base argument that is larger than the mod argument, which causes the modpow function to write memory before the beginning of its buffer, and (2) remote malicious servers to cause a denial of service (client crash) and possibly execute arbitrary code via a large bignum during authentication.
Timeline
ID reserved
By mitre
Published
- 19 years later
· 19 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 | 2.0 | High7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
- EPSS (exploitation in 30 days)
- 4.1% · top 9.1% of all CVEs (9 Nov 2026)
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
7
- GLSA-200408-04 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
- http://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- 10850 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- 12212 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-modpow.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- putty-code-execution(16885) (opens in a new tab)vdb-entryx_refsource_XFx_transferred
- 20040804 CORE-2004-0705: Vulnerabilities in PuTTY and PSCP (opens in a new tab)mailing-listx_refsource_BUGTRAQx_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-2004-1437 (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-2004-1440)Record last updated .