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Vulnerability record · CVE-2005-0687 · published 6 March 2005

CVE-2005-0687: Hashcash vulnerability

Hashcash · Hashcash

Format string vulnerability in Hashcash 1.16 allows remote attackers to cause a denial of service (memory consumption) and possibly execute arbitrary code via format string specifiers in a reply address, which is not properly handled when printing the header.

7.5 CVSS 2.0 High EPSS 2.9% · top 13.7%
7.5CVSS 2.0 base score
2.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
16 Jun 2026Last modified by NVD

Description

Format string vulnerability in Hashcash 1.16 allows remote attackers to cause a denial of service (memory consumption) and possibly execute arbitrary code via format string specifiers in a reply address, which is not properly handled when printing the header.

AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://bugs.gentoo.org/show_bug.cgi?id=83541 PatchVendor Advisory
http://secunia.com/advisories/14487 PatchVendor Advisory
http://www.gentoo.org/security/en/glsa/glsa-200503-12.xml PatchVendor Advisory
http://bugs.gentoo.org/show_bug.cgi?id=83541 PatchVendor Advisory
http://secunia.com/advisories/14487 PatchVendor Advisory
http://www.gentoo.org/security/en/glsa/glsa-200503-12.xml PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2006-3251Hashcash memory buffer overflow vulnerabilityHeap-based buffer overflow in the array_push function in hashcash.c for Hashcash before 1.21 might allow attackers to execute arbitrary code via craf…EPSS 3.7%6.8CVE-2006-3750Hashcash code injection vulnerabilityPHP remote file inclusion vulnerability in server.php in the Hashcash Component (com_hashcash) 1.2.1 for Joomla! allows remote attackers to execute a…EPSS 5.8%

Source: NIST National Vulnerability Database (record CVE-2005-0687), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.