CVE-2021-27771
HCL Sametime is susceptible a file transfer service vulnerability
User SID can be modified resulting in an Arbitrary File Upload or deletion of directories causing a Denial of Service. When interacting in a normal matter with the Sametime chat application, users hold a cookie containing their session ID (SID). This value is also used when sending chat messages, receiving notifications and/or transferring files.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
HCL Sametime is susceptible a file transfer service vulnerability
User SID can be modified resulting in an Arbitrary File Upload or deletion of directories causing a Denial of Service. When interacting in a normal matter with the Sametime chat application, users hold a cookie containing their session ID (SID). This value is also used when sending chat messages, receiving notifications and/or transferring files.
- Record
CVE-2021-27771- CVSS 3.1
- 8.2 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:H - Weakness
- CWE-434, CWE-22
- Updated
- 2026-11-02
EUVDEUVD-2021-14512
User SID can be modified resulting in an Arbitrary File Upload or deletion of directories causing a Denial of Service. When interacting in a normal matter with the Sametime chat application, users hold a cookie containing their session ID (SID). This value is also used when sending chat messages, receiving notifications and/or transferring files.
- Record
EUVD-2021-14512- CVSS 3.1
- 8.2 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:H - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-3jcp-j236-2qqc
User SID can be modified resulting in an Arbitrary File Upload or deletion of directories causing...
User SID can be modified resulting in an Arbitrary File Upload or deletion of directories causing a Denial of Service. When interacting in a normal matter with the Sametime chat application, users hold a cookie containing their session ID (SID). This value is also used when sending chat messages, receiving notifications and/or transferring files.
- Record
GHSA-3jcp-j236-2qqc- CVSS 3.1
- 7.6 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H - Weakness
- CWE-434
- Updated
- 2026-11-02
NVD
User SID can be modified resulting in an Arbitrary File Upload or deletion of directories causing a Denial of Service. When interacting in a normal matter with the Sametime chat application, users hold a cookie containing their session ID (SID). This value is also used when sending chat messages, receiving notifications and/or transferring files.
- Record
CVE-2021-27771- CVSS 3.1
- 8.2 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:H - CVSS 3.1
- 7.6 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H - CVSS 2.0
- 6.5 Medium
AV:N/AC:L/Au:S/C:P/I:P/A:P - Weakness
- CWE-22, CWE-434
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, products, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-27771 is a high vulnerability (CVSS 8.2) in Hcl Sametime, published May 12, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.73%, the 54th percentile. No source names a fixed version.