CVE-2015-7874: Buffer overflow in the chat server in KiTTY Portable 0.65.0.2p and earlier allows remote attackers to execute

Q: How do I fix CVE-2015-7874?

kitty portable: upgrade to newer than 0.65.0.2p. Exact commands for each OS are on this page.

Q: Is CVE-2015-7874 being exploited?

CVE-2015-7874 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2015-7874 affect?

CVE-2015-7874 affects kitty portable. Severity is critical (CVSS 9.8). Buffer overflow in the chat server in KiTTY Portable 0.65.0.2p and earlier allows remote attackers to execute arbitrary code via a long nickname.

Q: How urgent is CVE-2015-7874?

Priority 68/100. Critical severity; EPSS top 3%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2015-7874 is a critical-severity flaw (CVSS 9.8) affecting kitty portable. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow in the chat server in KiTTY Portable 0.65.0.2p and earlier allows remote attackers to execute arbitrary code via a long nickname.

Why this priority

Critical severity
EPSS top 3%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	13.9% (top 3%)
CISA exploited list	No
Weakness	CWE-120
Published	2020-01-15
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: portapps

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-01-15 16:15 UTCPublished CVE record published
2026-06-17 00:33 UTCUpdated Record last modified

portapps kitty portable UPGRADE

Affected: <= 0.65.0.2p

Fixed in: newer than 0.65.0.2p

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy kitty-portable || rpm -q kitty-portable || kitty-portable --version

2. UPGRADE to newer than 0.65.0.2p (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade kitty-portable

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade kitty-portable

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: KiTTY Portable 0.65.0.2p (Windows XP/7/10) - Chat Remote Buffer Overflow (SEH)

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2015-7874?

kitty portable: upgrade to newer than 0.65.0.2p. Exact commands for each OS are on this page.

Is CVE-2015-7874 being exploited?

CVE-2015-7874 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2015-7874 affect?

CVE-2015-7874 affects kitty portable. Severity is critical (CVSS 9.8). Buffer overflow in the chat server in KiTTY Portable 0.65.0.2p and earlier allows remote attackers to execute arbitrary code via a long nickname.

How urgent is CVE-2015-7874?

Priority 68/100. Critical severity; EPSS top 3%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

References

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