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CVE-2006-3251

20
FAUCET Score

CVE-2006-3251 describes a heap-based buffer overflow in the array_push function within hashcash.c, affecting Hashcash versions prior to 1.21. This vulnerability could allow an unauthenticated attacker to execute arbitrary code by supplying crafted entries. With a CVSS score of 7.5, it poses a significant risk due to its network-based attack vector and low attack complexity, potentially leading to partial confidentiality, integrity, and availability compromise. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.20CPE matchmatch criteria
cpe:2.3:a:hashcash:hashcash:*:*:*:*:*:*:*:*
1.00CPE matchmatch criteria
cpe:2.3:a:hashcash:hashcash:1.00:*:*:*:*:*:*:*
1.01CPE matchmatch criteria
cpe:2.3:a:hashcash:hashcash:1.01:*:*:*:*:*:*:*
1.02CPE matchmatch criteria
cpe:2.3:a:hashcash:hashcash:1.02:*:*:*:*:*:*:*
1.03CPE matchmatch criteria
cpe:2.3:a:hashcash:hashcash:1.03:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.5HIGH

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

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
3.65%
Probability of exploitation in next 30 days
EPSS Percentile
88.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0365 is in the 80th percentile among its peer group of 51,485 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

secunia.com / advisories/20800
Vendor Advisory
secunia.com / advisories/20846
Vendor Advisory
secunia.com / advisories/21146
Vendor Advisory
exchange.xforce.ibmcloud.com / vulnerabilities/27422
debian.org / security/2006/dsa-1114
gentoo.org / security/en/glsa/glsa-200606-25.xml
hashcash.org / source/CHANGELOG
securityfocus.com / bid/18659
Patch
vupen.com / english/advisories/2006/2551
Vendor Advisory