CVE-2004-1440
highpriority · track · 31EPSS 0.041 · 91 %ileEUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.4–7.5
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (9)
Products and version ranges known to be affected.
also known as (2)
Other names and identifiers for this entity.
sources
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references (14)
External citations — patches, advisories, analysis.
- http://marc.info/?l=bugtraq&m=109167869528138&w=2enisa_euvd
- http://secunia.com/advisories/12212/enisa_euvd
- http://www.chiark.greenend.org.uk/~sgtatham/putty/changes.htmlenisa_euvd
- http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-modpow.htmlenisa_euvd
- http://www.gentoo.org/security/en/glsa/glsa-200408-04.xmlenisa_euvd
- http://www.securityfocus.com/bid/10850enisa_euvd
- https://exchange.xforce.ibmcloud.com/vulnerabilities/16885enisa_euvd
- http://marc.info/?l=bugtraq&m=109167869528138&w=2nvd
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