medium Known exploitedREV. 01
CVE-2023-41763Skype for Business — the server made to fetch for others
Skype for Business can be talked into sending requests on an attacker's behalf, which widens what they can reach from outside. Microsoft rates the impact as limited and publishes nothing about the endpoint or the target.
Read the risk
THE VITAL STATS- CVSS score
- 5.3/ 10 CVSS v3.1
- EPSS probability
- 90% Likelihood of exploitation
- Attack complexity
- Low Conditions needed to exploit
- Known exploited
- Yes — CISA KEV
- CVE published
- 2023-10-10
- Added to KEV
- 2023-10-10
- Exploit published
- Not recorded
- Confidence
- medium
- Kill chain
- privilege escalation
- MITRE ATT&CK
- T1190
- Severity
- medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attacker needsNetwork access to the Skype for Business server.
Behind the card
3 REFERENCES- 01CVE recordNVD recordnvd.nist.gov
- 02CISACISA Known Exploited Vulnerabilities catalogcisa.gov
- 03Vendor advisorymsrc.microsoft.commsrc.microsoft.com
Field-level provenanceTRACE THE SOURCES +
Which source supports each field, when it was retrieved, and who extracted it.
| Fields | Source | Retrieved | Extractor | Confidence |
|---|---|---|---|---|
| cvss, exploitation.attack_complexity, exploitation.exploit_available, references, published_at | nvd.nist.gov | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| exploitation.known_exploited, exploitation.kev_added | cisa.gov | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| epss | api.first.org | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| title, summary, severity, remediation, mitre_attack, kill_chain, recommended_action, confidence, tags, exploitation.prerequisites | nvd.nist.gov | 2026-09-24 | claude-code | high |
Printing history
THE RECORD- r1Initial base card
First printing. This card has not been reprinted since publication.