Lucene search
Microsoft Security Response CenterMSRC:5CBA045F26BE90EBCCB3C34E5CE2A790HistoryMar 16, 2021 - 7:00 a.m.
Guidance for responders: Investigating and remediating on-premises Exchange Server vulnerabilities
2021-03-1607:00:00
Microsoft Security Response Center
msrc.microsoft.com
24
9.1 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
7.5 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
0.975 High
EPSS
Percentile
100.0%
This guidance will help customers address threats taking advantage of the recently disclosed Microsoft Exchange Server on-premises vulnerabilities CVE-2021-26855, CVE-2021-26858, CVE-2021-26857, and CVE-2021-27065, which are being exploited. We strongly urge customers to immediately update systems. Failing to address these vulnerabilities can result in compromise of your on-premises Exchange Server and, potentially, other parts of your internal network.
Related
securelist
securelist
Zero-day vulnerabilities in Microsoft Exchange Server
2021-03-04 17:20:57
Black Kingdom ransomware
2021-06-17 10:00:41
IT threat evolution Q1 2021
2021-05-31 10:00:37
threatpost
threatpost
CISA Orders Fed Agencies to Patch Exchange Servers
2021-03-04 17:08:36
Attackers Target ProxyLogon Exploit to Install Cryptojacker
2021-04-15 12:19:13
Microsoft Exchange Servers See ProxyLogon Patching Frenzy
2021-03-24 18:39:26
akamaiblog
akamaiblog
How Akamai Can Help You Fight the Latest Exploitation Attempts Against Microsoft Exchange
2021-03-15 22:30:00
Microsoft Exchange and Verkada Hacks: Isolate Your Apps and APIs from the Internet Cesspool
2021-03-15 22:15:00
Authentication: Lessons Learned from Microsoft Exchange and F5 BIG-IP Hacks
2021-03-24 14:00:00
ics
ics
talosblog
talosblog
Threat Advisory: HAFNIUM and Microsoft Exchange zero-day
2021-03-08 10:18:43
cisa
cisa
Microsoft Releases Out-of-Band Security Updates for Exchange Server
2021-03-02 00:00:00
hivepro
hivepro
Have you patched the vulnerabilities in Microsoft Exchange Server?
2021-08-18 11:01:05
BackdoorDiplomacy targets the telecom industry in the Middle East
2022-12-08 07:20:51
AvosLocker Ransomware group has targeted 50+ Organizations Worldwide
2022-03-24 06:30:44
thn
thn
Microsoft Exchange Cyber Attack — What Do We Know So Far?
2021-03-08 10:15:00
URGENT — 4 Actively Exploited 0-Day Flaws Found in Microsoft Exchange
2021-03-03 07:28:00
Prometei Botnet Exploiting Unpatched Microsoft Exchange Servers
2021-04-23 07:42:00
msrc
msrc
impervablog
impervablog
malwarebytes
malwarebytes
Patch now! Exchange servers attacked by Hafnium zero-days
2021-03-03 12:34:27
The top 5 most routinely exploited vulnerabilities of 2021
2022-04-29 16:28:20
Microsoft Exchange attacks cause panic as criminals go shell collecting
2021-03-09 19:59:37
fireeye
fireeye
krebs
krebs
Microsoft: Chinese Cyberspies Used 4 Exchange Server Flaws to Plunder Emails
2021-03-02 21:19:17
carbonblack
carbonblack
githubexploit
githubexploit
Exploit for Vulnerability in Microsoft
2021-03-05 08:22:07
Exploit for Vulnerability in Microsoft
2021-03-09 10:36:44
Exploit for Vulnerability in Microsoft
2021-03-11 21:18:29
mmpc
mmpc
HAFNIUM targeting Exchange Servers with 0-day exploits
2021-03-02 21:07:53
Evolving trends in Iranian threat actor activity – MSTIC presentation at CyberWarCon 2021
2021-11-16 16:00:08
Profiling DEV-0270: PHOSPHORUS’ ransomware operations
2022-09-07 21:00:00
attackerkb
attackerkb
CVE-2021-26858
2021-03-03 00:00:00
CVE-2021-26857
2021-03-03 00:00:00
mssecure
mssecure
HAFNIUM targeting Exchange Servers with 0-day exploits
2021-03-02 21:07:53
Evolving trends in Iranian threat actor activity – MSTIC presentation at CyberWarCon 2021
2021-11-16 16:00:08
Profiling DEV-0270: PHOSPHORUS’ ransomware operations
2022-09-07 21:00:00
rapid7blog
rapid7blog
Rapid7’s InsightIDR Enables Detection And Response to Microsoft Exchange Zero-Day
2021-03-03 00:41:04
Defending Against the Zero Day: Analyzing Attacker Behavior Post-Exploitation of Microsoft Exchange
2021-03-23 14:04:36
Mass Exploitation of Exchange Server Zero-Day CVEs: What You Need to Know
2021-03-03 19:23:42
nessus
nessus
Security Updates for Microsoft Exchange Server (March 2021)
2021-03-03 00:00:00
Security Update for Microsoft Exchange Server 2010 SP 3 (March 2021)
2021-03-04 00:00:00
Microsoft Exchange Server Authentication Bypass
2021-03-08 00:00:00
nuclei
nuclei
Microsoft Exchange Server SSRF Vulnerability
2021-03-06 07:00:59
mskb
mskb
zdt
zdt
Microsoft Exchange ProxyLogon Remote Code Execution Exploit
2021-03-23 00:00:00
Microsoft Exchange 2019 - SSRF to Arbitrary File Write (Proxylogon) Exploit
2021-03-11 00:00:00
Microsoft Exchange 2019 - Unauthenticated Email Download Exploit
2021-05-21 00:00:00
checkpoint_advisories
checkpoint_advisories
packetstorm
packetstorm
Microsoft Exchange ProxyLogon Remote Code Execution
2021-03-23 00:00:00
Microsoft Exchange ProxyLogon Collector
2021-05-21 00:00:00
Microsoft Exchange 2019 Unauthenticated Email Download
2021-05-18 00:00:00
kaspersky
kaspersky
KLA12103 ACE vulnerabilities in Microsoft Exchange Server
2021-03-02 00:00:00
qualysblog
qualysblog
metasploit
metasploit
Microsoft Exchange ProxyLogon RCE
2021-03-12 23:49:45
Microsoft Exchange ProxyLogon Scanner
2021-03-07 13:37:20
Microsoft Exchange ProxyLogon Collector
2021-03-09 19:52:01
exploitdb
exploitdb
Microsoft Exchange 2019 - Unauthenticated Email Download (Metasploit)
2021-05-21 00:00:00
Microsoft Exchange 2019 - Unauthenticated Email Download
2021-05-18 00:00:00
avleonov
avleonov
Vulnerability Management news and publications #2
2022-08-14 11:30:44
Joint Advisory AA22-279A and Vulristics
2022-10-21 20:10:13
Vulristics: Microsoft Patch Tuesdays Q1 2021
2021-03-26 02:47:52
cisa_kev
cisa_kev
Microsoft Exchange Server Remote Code Execution Vulnerability
2021-11-03 00:00:00
Microsoft Exchange Server Remote Code Execution Vulnerability
2021-11-03 00:00:00
Microsoft Exchange Server Remote Code Execution Vulnerability
2021-11-03 00:00:00
prion
prion
Remote code execution
2021-03-03 00:15:00
Remote code execution
2021-03-03 00:15:00
Remote code execution
2021-03-03 00:15:00
cve
cve
hackerone
hackerone
U.S. Dept Of Defense: SSRF due to CVE-2021-26855 on ████████
2021-03-07 11:31:33
U.S. Dept Of Defense: CVE-2021-26855 on ████████ resulting in SSRF
2021-03-07 11:37:32
saint
saint
Microsoft Exchange Server ProxyLogon vulnerability
2021-03-19 00:00:00
Microsoft Exchange Server ProxyLogon vulnerability
2021-03-19 00:00:00
Microsoft Exchange Server ProxyLogon vulnerability
2021-03-19 00:00:00
wallarmlab
wallarmlab
mscve
mscve
Microsoft Exchange Server Remote Code Execution Vulnerability
2021-03-02 08:00:00
Microsoft Exchange Server Remote Code Execution Vulnerability
2021-03-02 08:00:00
Microsoft Exchange Server Remote Code Execution Vulnerability
2021-03-02 08:00:00
googleprojectzero
googleprojectzero
The More You Know, The More You Know You Don’t Know
2022-04-19 00:00:00
9.1 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
7.5 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
0.975 High
EPSS
Percentile
100.0%
Related for MSRC:5CBA045F26BE90EBCCB3C34E5CE2A790