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| Vulnerability ID | VCID-q9k5-8vt9-bfgz |
| Aliases |
CVE-2025-54489
|
| Summary | A stack-based buffer overflow vulnerability exists in the MFER parsing functionality of The Biosig Project libbiosig 3.9.0 and Master Branch (35a819fa). A specially crafted MFER file can lead to arbitrary code execution. An attacker can provide a malicious file to trigger this vulnerability.This vulnerability manifests on line 8970 of biosig.c on the current master branch (35a819fa), when the Tag is 63: else if (tag==63) { uint8_t tag2=255, len2=255; count = 0; while ((count<len) && !(FlagInfiniteLength && len2==0 && tag2==0)){ curPos += ifread(&tag2,1,1,hdr); curPos += ifread(&len2,1,1,hdr); if (VERBOSE_LEVEL==9) fprintf(stdout,"MFER: tag=%3i chan=%2i len=%-4i tag2=%3i len2=%3i curPos=%i %li count=%4i\n",tag,chan,len,tag2,len2,curPos,iftell(hdr),(int)count); if (FlagInfiniteLength && len2==0 && tag2==0) break; count += (2+len2); curPos += ifread(&buf,1,len2,hdr); Here, the number of bytes read is not the Data Length decoded from the current frame in the file (`len`) but rather is a new length contained in a single octet read from the same input file (`len2`). Despite this, a stack-based buffer overflow condition can still occur, as the destination buffer is still `buf`, which has a size of only 128 bytes, while `len2` can be as large as 255. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 5.9 |
| Risk | 3.0 |
| Affected and Fixed Packages | Package Details |
| CWE-121 | Stack-based Buffer Overflow |
| System | Score | Found at |
|---|---|---|
| epss | 0.00519 | https://api.first.org/data/v1/epss?cve=CVE-2025-54489 |
| epss | 0.00519 | https://api.first.org/data/v1/epss?cve=CVE-2025-54489 |
| epss | 0.00519 | https://api.first.org/data/v1/epss?cve=CVE-2025-54489 |
| cvssv3.1 | 9.8 | https://talosintelligence.com/vulnerability_reports/TALOS-2025-2234 |
| ssvc | Track | https://talosintelligence.com/vulnerability_reports/TALOS-2025-2234 |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
| Percentile | 0.67242 |
| EPSS Score | 0.00519 |
| Published At | June 11, 2026, 12:55 p.m. |
| Date | Actor | Action | Source | VulnerableCode Version |
|---|---|---|---|---|
| 2026-06-11T16:56:09.398709+00:00 | Vulnrichment | Import | https://github.com/cisagov/vulnrichment/blob/develop/2025/54xxx/CVE-2025-54489.json | 38.6.0 |