CVE-2026-80077: Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a net

Q: How do I fix CVE-2026-80077?

remote desktop client: upgrade to 1.2.7279. Exact commands for each OS are on this page.

Q: Is CVE-2026-80077 being exploited?

CVE-2026-80077 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-2026-80077 affect?

CVE-2026-80077 affects remote desktop client. Severity is high (CVSS 8.8). Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

Q: How urgent is CVE-2026-80077?

Priority 50/100. High severity; On your watchlist

This month

HIGH 8.8WATCHLISTUPGRADE

CVE-2026-80077 is a high-severity flaw (CVSS 8.8) affecting remote desktop client. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-122
Published	2026-09-08
Last modified	2026-09-22

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-09-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-08 18:20 UTCPublished CVE record published
2026-09-22 13:20 UTCUpdated Record last modified

microsoft remote desktop client UPGRADE

Affected: < 1.2.7279

Fixed in: 1.2.7279

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy remote-desktop-client || rpm -q remote-desktop-client || remote-desktop-client --version

2. UPGRADE to 1.2.7279 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade remote-desktop-client

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade remote-desktop-client

Note

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

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-2026-80077?

remote desktop client: upgrade to 1.2.7279. Exact commands for each OS are on this page.

Is CVE-2026-80077 being exploited?

CVE-2026-80077 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-2026-80077 affect?

CVE-2026-80077 affects remote desktop client. Severity is high (CVSS 8.8). Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

How urgent is CVE-2026-80077?

Priority 50/100. High severity; On your watchlist

Software pages

WinRM and RDP vulnerabilities

Related CVEs

CVE-2026-78463 HIGH 8.8 UPGRADE Improper control of generation of code ('code injection') in Remote Desktop Client allows an unauthorized atta
CVE-2026-80074 HIGH 8.8 UPGRADE Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a net
CVE-2026-57098 HIGH 7.5 UPGRADE Improper verification of cryptographic signature in Windows RDP Client allows an unauthorized attacker to disc

References

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