CVE-2023-23397

critical

Description

Microsoft Outlook Elevation of Privilege Vulnerability

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-23397

https://www.infosecurity-magazine.com/news/western-logistics-tech-firms/

https://www.darkreading.com/cyberattacks-data-breaches/cisa-russia-fancy-bear-targeting-logistics-it-firms

https://securityaffairs.com/178165/apt/russia-linked-apt28-targets-western-logistics-entities-and-technology-firms.html

https://www.theregister.com/2025/05/21/russias_fancy_bear_alert/

https://www.securityweek.com/cisa-says-russian-hackers-targeting-western-supply-lines-to-ukraine/

https://www.databreachtoday.com/russian-intelligence-hackers-stalk-western-logistics-firms-a-28449

https://www.cisa.gov/news-events/cybersecurity-advisories/aa25-141a

https://www.bleepingcomputer.com/news/security/russian-hackers-breach-orgs-to-track-aid-routes-to-ukraine/

https://thehackernews.com/2025/05/russian-hackers-exploit-email-and-vpn.html

https://cyberscoop.com/russian-apt28-cyberattacks-target-western-logistics-ukraine/

https://www.welivesecurity.com/en/eset-research/operation-roundpress/

https://www.darkreading.com/cyberattacks-data-breaches/multiple-group-exploiting-ntlm-flaw

https://www.theregister.com/2025/02/25/new_ics_malware_dragos/

https://www.helpnetsecurity.com/2025/02/13/sandworm-apts-initial-access-subgroup-hits-organizations-accross-the-globe/

https://hackread.com/microsoft-badpilot-campaign-seashell-blizzard-usa-uk/

https://www.theregister.com/2025/02/12/russias_sandworm_caught_stealing_credentials/

https://www.securityweek.com/russian-seashell-blizzard-hackers-gain-maintain-access-to-high-value-targets-microsoft/

https://www.microsoft.com/en-us/security/blog/2025/02/12/the-badpilot-campaign-seashell-blizzard-subgroup-conducts-multiyear-global-access-operation/

https://www.darkreading.com/threat-intelligence/microsoft-russian-sandworm-apt-exploits-edge-bugs-globally

https://www.bleepingcomputer.com/news/security/badpilot-network-hacking-campaign-fuels-russian-sandworm-attacks/

https://therecord.media/sandworm-subgroup-russia-europe

https://thehackernews.com/2025/02/microsoft-uncovers-sandworm-subgroups.html

https://www.darkreading.com/application-security/microsoft-ntlm-zero-day-remain-unpatched-april

https://securelist.com/exploits-and-vulnerabilities-q3-2024/114839/

https://www.securityweek.com/citrix-cisco-fortinet-zero-days-among-2023s-most-exploited-vulnerabilities/

https://www.cisa.gov/news-events/cybersecurity-advisories/aa24-317a

https://thehackernews.com/2024/05/microsoft-outlook-flaw-exploited-by.html

https://www.microsoft.com/en-us/security/blog/2024/04/22/analyzing-forest-blizzards-custom-post-compromise-tool-for-exploiting-cve-2022-38028-to-obtain-credentials/

https://securityintelligence.com/x-force/itg05-leverages-malware-arsenal/

https://thehackernews.com/2024/02/cybersecurity-agencies-warn-ubiquiti.html?&web_view=true

https://arstechnica.com/security/2024/02/kremlin-backed-hackers-are-infecting-ubiquity-edgerouters-fbi-warns/

https://www.trendmicro.com/en_us/research/24/a/pawn-storm-uses-brute-force-and-stealth.html?&web_view=true

https://thehackernews.com/2023/12/beware-experts-reveal-new-details-on.html

https://thehackernews.com/2023/12/russian-apt28-hackers-targeting-13.html?&web_view=true

https://securityaffairs.com/155420/apt/apt8-exploited-outlook-0day-target-nato.html

https://unit42.paloaltonetworks.com/russian-apt-fighting-ursa-exploits-cve-2023-233397/

https://meterpreter.org/proofpoint-uncovers-ta422-apt28s-dedicated-phishing-exploitation-loop/

https://therecord.media/unpatched-microsoft-outlook-email-attacks-fancy-bear

https://www.bleepingcomputer.com/news/security/france-says-russian-state-hackers-breached-numerous-critical-networks/

https://thehackernews.com/2023/03/from-ransomware-to-cyber-espionage-55.html

https://www.mandiant.com/resources/blog/zero-days-exploited-2022

https://web-assets.esetstatic.com/wls/en/papers/threat-reports/eset-apt-activity-report-q2-2023-q3-2023.pdf

https://www.tenable.com/blog/microsoft-patch-tuesday-2023-year-in-review

https://www.tenable.com/blog/microsofts-october-2023-patch-tuesday-addresses-103-cves-cve-2023-36563-cve-2023-41763

https://www.tenable.com/blog/microsofts-september-2023-patch-tuesday-addresses-61-cves-cve-2023-36761

https://www.tenable.com/blog/microsofts-march-2023-patch-tuesday-addresses-76-cves-cve-2023-23397

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-23397

Details

Source: Mitre, NVD

Published: 2023-03-14

Updated: 2025-10-27

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.93486

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest