Medium severity · published May 13, 2026
CVE-2026-42780
BIG-IP SSL Orchestrator vulnerability
4.9
CVSS
0.9%
EPSS
No
On KEV
Description
A directory traversal vulnerability exists in BIG-IP SSL Orchestrator that allows an authenticated attacker with high privilege to overwrite, delete or corrupt arbitrary local files.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 59% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BI
BIG-IP · F5
21.0.0 before 21.0.0.1; 17.5.0 before 17.5.1.5; 17.1.0 before 17.1.3.1; 16.1.0 · source: vendor
SO
SSL Orchestrator · F5
13.0 before 13.1.3; 12.0 before 12.3.2; 11.0 before 11.4.1 · source: vendor
BS
Big-ip Ssl Orchestrator · F5
17.1.0 through 17.1.3; 17.5.0 through 17.5.1; 21.0.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42780
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-42780
Mitigation
https://my.f5.com/manage/s/article/K000149743
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