Security readout for executives and security teams
Plain-English summary
AfreecaTV streamer version 1.0.0.1 can mishandle a long FanTicket value sent through its streamer websocket service. The CVE describes this as a stack-based buffer overflow that could let an attacker run code on the affected machine if the service is reachable.
Executive priority
Treat as high priority for managed desktops or streaming workstations using AfreecaTV. The business urgency depends on whether affected endpoints run the vulnerable service and whether port 21201 is exposed beyond trusted local access.
Technical view
The vulnerable component is afreecatvstreamer.exe 1.0.0.1. The issue is reported in a websocket-exposed streamer service on port 21201, where unvalidated FanTicket field length reaches a strcpy() operation, causing stack-based buffer overflow and potential remote code execution. CVSS 3.1 is 7.5 high with PR:L and AC:H.
Likely exposure
Exposure is likely limited to endpoints running AfreecaTV streamer 1.0.0.1 with the related service active and reachable on port 21201. It is not a general server-side internet service based on the supplied sources.
Exploitation context
The supplied bundle does not show CISA KEV listing or confirmed active exploitation. The attack path requires network reachability to the streamer service and low privileges according to the CVSS vector, with high attack complexity.
Researcher notes
The source description names a stack-based buffer overflow in strcpy() via FanTicket, while the bundle lists CWE-190. Treat the CWE mapping as less precise than the vulnerability narrative. No exploit details or fixed version are provided in the supplied sources.
Mitigation direction
- Identify and remove AfreecaTV streamer 1.0.0.1 where it is not business-required.
- Check AfreecaTV or KISA guidance for a fixed release or vendor workaround.
- Restrict access to port 21201 to trusted local or managed networks only.
- Disable the streamer service when streaming functionality is not required.
- Run the application with least privileges on managed endpoints.
Validation and detection
- Inventory endpoints for afreecatvstreamer.exe version 1.0.0.1.
- Check whether the streamer service is listening on port 21201.
- Confirm port 21201 is not reachable from untrusted networks.
- Review endpoint telemetry for unexpected crashes or child processes from afreecatvstreamer.exe.
- Document remediation status for each affected endpoint.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-190: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-7881 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H1.65.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.boho.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=36357CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.