CVE-2013-4852

Integer overflow in PuTTY 0.62 and earlier, WinSCP before 5.1.6, and other products that use PuTTY allows remote SSH servers to cause a denial of service (crash) and possibly execute arbitrary code in certain applications that use PuTTY via a negative size value in an RSA key signature during the SSH handshake, which triggers a heap-based buffer overflow.

Published: 2013-08-19 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2013-4852 is rated Moderate Risk (54.7/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.75%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2013-4852

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-03-30 2.56% 1.75% -0.81%
2 2025-03-29 1.75% 2.56% +0.81%
3 2025-03-17 — 1.75% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2013-4852

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2013-4852

OS Trackers for CVE-2013-4852

vendor priority summary link
debian low CVE-2013-4852 low priority: Debian including 2 source packages (filezilla, putty), 10 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 10. https://security-tracker.debian.org/tracker/CVE-2013-4852
gentoo normal CVE-2013-4852: 2 GLSA(s) (201308-01, 201309-08), 2 atom(s) (net-ftp/filezilla, net-misc/putty); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2013-4852
ubuntu medium CVE-2013-4852 medium priority: Ubuntu including 2 source packages (filezilla, putty), 32 status rows across 16 suites (artful, bionic, cosmic, lucid, precise, quantal, raring, saucy, trusty, upstream, utopic, vivid, wily, xenial, yakkety, zesty): released 16, ignored 12, not-affected 3, DNE 1. https://ubuntu.com/security/CVE-2013-4852

Affected software / configurations for CVE-2013-4852

Vendor Product Version Raw CPE
winscp winscp <= 5.1.5 cpe:2.3:a:winscp:winscp:*:*:*:*:*:*:*:*
winscp winscp 3.7.6 cpe:2.3:a:winscp:winscp:3.7.6:*:*:*:*:*:*:*
winscp winscp 3.8.2 cpe:2.3:a:winscp:winscp:3.8.2:*:*:*:*:*:*:*
winscp winscp 3.8_beta cpe:2.3:a:winscp:winscp:3.8_beta:*:*:*:*:*:*:*
winscp winscp 4.0.4 cpe:2.3:a:winscp:winscp:4.0.4:*:*:*:*:*:*:*
winscp winscp 4.0.5 cpe:2.3:a:winscp:winscp:4.0.5:*:*:*:*:*:*:*
winscp winscp 4.2.6 cpe:2.3:a:winscp:winscp:4.2.6:*:*:*:*:*:*:*
winscp winscp 4.2.7 cpe:2.3:a:winscp:winscp:4.2.7:*:*:*:*:*:*:*
winscp winscp 4.2.8 cpe:2.3:a:winscp:winscp:4.2.8:*:*:*:*:*:*:*
winscp winscp 4.2.9 cpe:2.3:a:winscp:winscp:4.2.9:*:*:*:*:*:*:*
winscp winscp 4.3.2 cpe:2.3:a:winscp:winscp:4.3.2:*:*:*:*:*:*:*
winscp winscp 4.3.4 cpe:2.3:a:winscp:winscp:4.3.4:*:*:*:*:*:*:*
winscp winscp 4.3.5 cpe:2.3:a:winscp:winscp:4.3.5:*:*:*:*:*:*:*
winscp winscp 4.3.6 cpe:2.3:a:winscp:winscp:4.3.6:*:*:*:*:*:*:*
winscp winscp 4.3.7 cpe:2.3:a:winscp:winscp:4.3.7:*:*:*:*:*:*:*
winscp winscp 4.3.8 cpe:2.3:a:winscp:winscp:4.3.8:*:*:*:*:*:*:*
winscp winscp 4.3.9 cpe:2.3:a:winscp:winscp:4.3.9:*:*:*:*:*:*:*
winscp winscp 4.4.0 cpe:2.3:a:winscp:winscp:4.4.0:*:*:*:*:*:*:*
winscp winscp 5.0 cpe:2.3:a:winscp:winscp:5.0:beta:*:*:*:*:*:*
winscp winscp 5.0.1 cpe:2.3:a:winscp:winscp:5.0.1:beta:*:*:*:*:*:*
winscp winscp 5.0.2 cpe:2.3:a:winscp:winscp:5.0.2:beta:*:*:*:*:*:*
winscp winscp 5.0.3 cpe:2.3:a:winscp:winscp:5.0.3:beta:*:*:*:*:*:*
winscp winscp 5.0.4 cpe:2.3:a:winscp:winscp:5.0.4:beta:*:*:*:*:*:*
winscp winscp 5.0.5 cpe:2.3:a:winscp:winscp:5.0.5:beta:*:*:*:*:*:*
winscp winscp 5.0.6 cpe:2.3:a:winscp:winscp:5.0.6:beta:*:*:*:*:*:*
winscp winscp 5.0.7 cpe:2.3:a:winscp:winscp:5.0.7:beta:*:*:*:*:*:*
winscp winscp 5.0.8 cpe:2.3:a:winscp:winscp:5.0.8:rc:*:*:*:*:*:*
winscp winscp 5.0.9 cpe:2.3:a:winscp:winscp:5.0.9:rc:*:*:*:*:*:*
winscp winscp 5.1 cpe:2.3:a:winscp:winscp:5.1:*:*:*:*:*:*:*
winscp winscp 5.1.1 cpe:2.3:a:winscp:winscp:5.1.1:*:*:*:*:*:*:*
winscp winscp 5.1.2 cpe:2.3:a:winscp:winscp:5.1.2:*:*:*:*:*:*:*
winscp winscp 5.1.3 cpe:2.3:a:winscp:winscp:5.1.3:*:*:*:*:*:*:*
winscp winscp 5.1.4 cpe:2.3:a:winscp:winscp:5.1.4:*:*:*:*:*:*:*
debian debian_linux 6.0 cpe:2.3:o:debian:debian_linux:6.0:*:*:*:*:*:*:*
debian debian_linux 7.0 cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
debian debian_linux 7.1 cpe:2.3:o:debian:debian_linux:7.1:*:*:*:*:*:*:*
opensuse opensuse 12.3 cpe:2.3:o:opensuse:opensuse:12.3:*:*:*:*:*:*:*
putty putty 0.45 cpe:2.3:a:putty:putty:0.45:*:*:*:*:*:*:*
putty putty 0.46 cpe:2.3:a:putty:putty:0.46:*:*:*:*:*:*:*
putty putty 0.47 cpe:2.3:a:putty:putty:0.47:*:*:*:*:*:*:*
putty putty 0.48 cpe:2.3:a:putty:putty:0.48:*:*:*:*:*:*:*
putty putty 0.49 cpe:2.3:a:putty:putty:0.49:*:*:*:*:*:*:*
putty putty 0.50 cpe:2.3:a:putty:putty:0.50:*:*:*:*:*:*:*
putty putty 0.51 cpe:2.3:a:putty:putty:0.51:*:*:*:*:*:*:*
putty putty 0.52 cpe:2.3:a:putty:putty:0.52:*:*:*:*:*:*:*
putty putty 0.53b cpe:2.3:a:putty:putty:0.53b:*:*:*:*:*:*:*
putty putty 0.54 cpe:2.3:a:putty:putty:0.54:*:*:*:*:*:*:*
putty putty 0.55 cpe:2.3:a:putty:putty:0.55:*:*:*:*:*:*:*
putty putty 0.56 cpe:2.3:a:putty:putty:0.56:*:*:*:*:*:*:*
putty putty 0.57 cpe:2.3:a:putty:putty:0.57:*:*:*:*:*:*:*
putty putty 0.58 cpe:2.3:a:putty:putty:0.58:*:*:*:*:*:*:*
putty putty 0.59 cpe:2.3:a:putty:putty:0.59:*:*:*:*:*:*:*
putty putty 0.60 cpe:2.3:a:putty:putty:0.60:*:*:*:*:*:*:*
putty putty 0.61 cpe:2.3:a:putty:putty:0.61:*:*:*:*:*:*:*
putty putty 2010-06-01 cpe:2.3:a:putty:putty:2010-06-01:r8967:*:*:development_snapshot:*:*:*
simon_tatham putty <= 0.62 cpe:2.3:a:simon_tatham:putty:*:*:*:*:*:*:*:*
simon_tatham putty 0.53 cpe:2.3:a:simon_tatham:putty:0.53:*:*:*:*:*:*:*

References for CVE-2013-4852

cvelogic Threat Intelligence