CVE-2026-55005
HIGHCVSS 8.8/10EPSS 0.66%
Last modified
CVE-2026-55005 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.. EPSS estimates a 0.66% chance of exploitation in the next 30 days.
Description
Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Microsoft | Exchange Server | 2016 | Cumulative Update 23 |
| Microsoft | Exchange Server | 2019 | Cumulative Update 14 |
| Microsoft | Exchange Server Subscription Edition | < 15.02.2562.045 | — |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-55005?
Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.
How severe is CVE-2026-55005?
CVE-2026-55005 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.66% probability of exploitation in the next 30 days.
How do I fix CVE-2026-55005?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-5500wolfSSL's wc_PKCS7_DecodeAuthEnvelopedData() does not proper…5.9
- CVE-2026-55000Use after free in Windows USB Print Driver allows an unautho…6.4
- CVE-2026-55001Improper certificate validation in Windows Active Directory …7.8
- CVE-2026-55002External control of file name or path in SQL Server allows a…8.8
- CVE-2026-55003Use of uninitialized resource in Windows RDP allows an unaut…6.5
- CVE-2026-55004Double free in Microsoft Printer Drivers allows an authorize…7.8
- CVE-2026-55006Insufficient granularity of access control in Microsoft Exch…7.8
- CVE-2026-55008Improper neutralization of input during web page generation …9.6
- CVE-2026-55009Deserialization of untrusted data in Microsoft Exchange Serv…7.8
- CVE-2026-5501wolfSSL_X509_verify_cert in the OpenSSL compatibility layer …8.1
- CVE-2026-55010Heap-based buffer overflow in Minecraft Bedrock Dedicated Se…9.8
- CVE-2026-55011Integer underflow (wrap or wraparound) in Microsoft Defender…7.8
Are you affected by CVE-2026-55005?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST