How severe is CVE-2013-4852?

CVE-2013-4852 has a CVSS 2.0 base score of 6.8, rated medium severity.

Is CVE-2013-4852 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2013-4852?

CVE-2013-4852 primarily affects Winscp. In total, 57 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2013-4852?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2013-4852 published?

CVE-2013-4852 was published on 2013-08-19 and last updated on 2026-06-16.

CVE-2013-4852

CVE-2013-4852 is a medium-severity vulnerability in Winscp with a CVSS 2.0 base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-189.

Key facts

Severity: Medium (CVSS 2.0 base score 6.8)
EPSS exploit prediction: 3% (88th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-189
Affected product: Winscp
Published: 2013-08-19
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2013-4852?: CVE-2013-4852 has a CVSS 2.0 base score of 6.8, rated medium severity.
Is CVE-2013-4852 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-4852?: CVE-2013-4852 primarily affects Winscp. In total, 57 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-4852?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2013-4852 published?: CVE-2013-4852 was published on 2013-08-19 and last updated on 2026-06-16.

References

Affected products (57)

cpe:2.3:a:winscp:winscp:*:*:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:3.7.6:*:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:3.8.2:*:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:3.8_beta:*:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:4.0.4:*:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:4.0.5:*:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:4.2.6:*:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:4.2.7:*:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:4.2.8:*:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:4.2.9:*:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:4.3.2:*:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:4.3.4:*:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:4.3.5:*:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:4.3.6:*:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:4.3.7:*:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:4.3.8:*:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:4.3.9:*:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:4.4.0:*:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:5.0:beta:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:5.0.1:beta:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:5.0.2:beta:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:5.0.3:beta:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:5.0.4:beta:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:5.0.5:beta:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:5.0.6:beta:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:5.0.7:beta:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:5.0.8:rc:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:5.0.9:rc:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:5.1:*:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:5.1.1:*:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:5.1.2:*:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:5.1.3:*:*:*:*:*:*:*
cpe:2.3:a:winscp:winscp:5.1.4:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:6.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:7.1:*:*:*:*:*:*:*
cpe:2.3:o:opensuse:opensuse:12.3:*:*:*:*:*:*:*
cpe:2.3:a:putty:putty:0.45:*:*:*:*:*:*:*
cpe:2.3:a:putty:putty:0.46:*:*:*:*:*:*:*
cpe:2.3:a:putty:putty:0.47:*:*:*:*:*:*:*

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