A privilege escalation vulnerability existed in the Below service prior to v0.9.0 due to the creation of a world-writable directory at /var/log/below. This could have allowed local unprivileged users to escalate to root privileges through symlink attacks that manipulate files such as /etc/shadow.
{
"cna_assigner": "facebook",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/27xxx/CVE-2025-27591.json"
}{
"extracted_events": [
{
"range": [
{
"introduced": "0.0.0"
},
{
"fixed": "0.9.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
{
"fixed": "da9382e6e3e332fd2c3195e22f34977f83f0f1f3"
}
],
"source": "REFERENCES_COMMIT"
},
{
"cpe": "cpe:2.3:a:facebook:below:*:*:*:*:*:rust:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "0.9.0"
}
],
"source": "CPE_RANGE"
}
]
}