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| Vulnerability ID | VCID-rt1c-v8gs-juha |
| Aliases |
CVE-2020-21686
|
| Summary | A stack-use-after-scope issue discovered in expand_mmac_params function in preproc.c in nasm before 2.15.04 allows remote attackers to cause a denial of service via crafted asm file. |
| Status | Published |
| Exploitability | None |
| Weighted Severity | None |
| Risk | None |
| Affected and Fixed Packages | Package Details |
| CWE-416 | Use After Free |
| System | Score | Found at |
|---|---|---|
| cvssv3 | 5.5 | https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-21686.json |
| epss | 0.00229 | https://api.first.org/data/v1/epss?cve=CVE-2020-21686 |
| epss | 0.00229 | https://api.first.org/data/v1/epss?cve=CVE-2020-21686 |
| ssvc | Track | https://bugzilla.nasm.us/show_bug.cgi?id=3392643 |
| cvssv3.1 | 3.3 | https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml |
| 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 |
| 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 | 0.45756 |
| EPSS Score | 0.00229 |
| Published At | June 4, 2026, 12:55 p.m. |
| Date | Actor | Action | Source | VulnerableCode Version |
|---|---|---|---|---|
| 2026-06-04T17:03:23.441389+00:00 | Debian Importer | Import | https://security-tracker.debian.org/tracker/data/json | 38.6.0 |