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CVE-2015-5309

15
FAUCET Score

CVE-2015-5309 describes an integer overflow vulnerability in the terminal emulator of PuTTY before version 0.66, affecting various openSUSE and Simon Tatham PuTTY distributions. This flaw allows remote attackers to trigger a denial of service (memory corruption) or potentially execute arbitrary code through a specially crafted ECH (erase characters) escape sequence, leading to a buffer underflow. The vulnerability has a CVSS score of 4.3, indicating a medium attack complexity and potential for partial availability impact, but no confidentiality or integrity impact. 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
42.1CPE matchmatch criteria
cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:*
13.1CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:13.1:*:*:*:*:*:*:*
13.2CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:*
<= 0.65CPE matchmatch criteria
cpe:2.3:a:simon_tatham:putty:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.3MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
3.47%
Probability of exploitation in next 30 days
EPSS Percentile
87.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0347 is in the 83rd percentile among its peer group of 19,953 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, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Remediation records are not available for this CVE.

References

lists.fedoraproject.org / pipermail/package-announce/2015-December/173021.html
lists.fedoraproject.org / pipermail/package-announce/2015-December/173094.html
lists.opensuse.org / opensuse-updates/2015-11/msg00099.html
security.gentoo.org / glsa/201606-01
chiark.greenend.org.uk / ~sgtatham/putty/wishlist/vuln-ech-overflow.html
Vendor Advisory
debian.org / security/2015/dsa-3409
securitytracker.com / id/1034308