CVE-2015-5309

medium

Published 2015-12-07 · Modified 2026-05-06

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CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

4.3

Description

Integer overflow in the terminal emulator in PuTTY before 0.66 allows remote attackers to cause a denial of service (memory corruption) or possibly execute arbitrary code via an ECH (erase characters) escape sequence with a large parameter value, which triggers a buffer underflow.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

OS	Version	Status	Fixed in
suse	42.1	affected
suse	13.1	affected
suse	13.2	affected
debian	bookworm	fixed	`0.66-1`
debian	bullseye	fixed	`0.66-1`
debian	forky	fixed	`0.66-1`
debian	sid	fixed	`0.66-1`
debian	trixie	fixed	`0.66-1`

Application impact

Vendor	Product	Versions	Fixed
simon_tatham	putty	`{"endIncluding":"0.65"}`

References

CWEs

CWE-189

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.