What’s Vulnerable › Vulnerabilities

CVE-2019-25714: Seeyon Office Anywhere (OA) A8 Unauthenticated Arbitrary File Write via htmlofficeservlet

• Severity: critical (CVSS 9.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-21 · updated 2026-06-17
• Weakness: CWE-434

Description

Seeyon OA A8 contains an unauthenticated arbitrary file write vulnerability in the /seeyon/htmlofficeservlet endpoint that allows remote attackers to write arbitrary files to the web application root by sending specially crafted POST requests with custom base64-encoded payloads. Attackers can write JSP webshells to the web root and execute them through the web server to achieve arbitrary OS command execution with web server privileges. Exploitation evidence was first observed by the Shadowserver Foundation on 2021-03-26 (UTC).

Affected products

• Seeyon Internet Software A8+ Collaborative Management Software: 7.0, 7.0sp1, 7.0sp2, 7.0sp3, 7.1
• Seeyon Internet Software A8-V5 Collaborative Management Software: 6.1sp1

References

• https://sourceforge.net/software/product/A8/
• https://static-aliyun-doc.oss-cn-hangzhou.aliyuncs.com/download/pdf/90916/Security_Notification_reseller_en-US.pdf
• https://web.archive.org/web/20190821034711/http://wyb0.com/posts/2019/seeyon-htmlofficeservlet-getshell/
• https://wiki.96.mk/Web%E5%AE%89%E5%85%A8/%E8%87%B4%E8%BF%9Coa/%E8%87%B4%E8%BF%9C%20OA%20A8%20htmlofficeservlet%20getshell%20%E6%BC%8F%E6%B4%9E/
• https://www.broadcom.com/support/security-center/attacksignatures/detail?asid=31713
• https://www.fortiguard.com/encyclopedia/ips/48874/seeyon-office-anywhere-htmlofficeservlet-arbitrary-file-upload
• https://www.vulncheck.com/advisories/seeyon-office-anywhere-oa-a8-unauthenticated-arbitrary-file-write-via-htmlofficeservlet

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