CVE-2025-27591

MEDIUMNVD 6.86.8—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.8 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 71% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
6.8
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
6.8
EG Score
6.8(medium)
EG Risk
47(Track)
EG Risk 47/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity68% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
28.5%
KEV
Not listed

Published

March 11, 2025

Last Modified

July 3, 2025

References (3)

Affected Packages

(1 across 1 ecosystem)
crates.io(1)
PackageVulnerable rangeFixed inDependents
below—0.9.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 48× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-23 02:52 UTCEG score recompute
  2. 2026-07-22 14:07 UTCEPSS rescore
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  1. 2026-07-07 13:45 UTCEPSS rescore
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  65. 2026-05-30 09:41 UTCEG score recompute
  66. 2026-05-29 13:44 UTCEPSS rescore

Publicly available exploits

(10 references)

Working exploit code is in the public domain (10 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoC0x00Jeff/CVE-2025-27591
    First seen Nov 19, 2025

    self cleaning CVE-2025-27591 Poc that grants a root reverse shell instead of modifying passwd files

    Open source ↗
  • GitHub PoC0xDTC/Below-Logger-Symlink-Attack_CVE-2025-27591
    First seen Nov 13, 2025

    A Bash-based privilege escalation exploit targeting the `below` system performance monitoring tool. This refurbished exploit leverages a symlink vulnerability in the logging mechanism to inject a root user into `/etc/passwd`, achieving full root access.

    Open source ↗
  • GitHub PoCVisaiCyber/CVE-2025-27591-below-
    First seen Sep 3, 2025

    Local Privilege Escalation vai `below` (CVE-2025-27591) - PoC Exploit

    Open source ↗
  • GitHub PoCCythonic1/CVE-2025-27591
    First seen Jul 31, 2025

    a C exploit for CVE-2025-27591, which allow an attacker to escalate privilege to root.

    Open source ↗
  • GitHub PoC00xCanelo/CVE-2025-27591
    First seen Jul 19, 2025

    🔥 Local Privilege Escalation Exploit for CVE-2025-27591 | Abuses world-writable log dir in Below to gain root via /etc/passwd injection

    Open source ↗
  • GitHub PoCincommatose/CVE-2025-27591-PoC
    First seen Jul 18, 2025

    A Proof of Concept for CVE-2025-27591, a local privilege escalation in Below < v0.9.0

    Open source ↗
  • GitHub PoCdollarboysushil/Linux-Privilege-Escalation-CVE-2025-27591
    First seen Jul 15, 2025

    CVE-2025-27591 is a known privilege escalation vulnerability in the Below service (version < v0.9.0)

    Open source ↗
  • GitHub PoCBridgerAlderson/CVE-2025-27591-PoC
    First seen Jul 13, 2025

    CVE-2025-27591 is a privilege escalation vulnerability that affected the Below service before version 0.9.0

    Open source ↗
  • GitHub PoCrvizx/CVE-2025-27591
    First seen Jul 12, 2025

    Below v0.8.1 - Local Privilege Escalation (CVE-2025-27591) - PoC Exploit

    Open source ↗
  • GitHub PoCobamalaolu/CVE-2025-27591
    First seen Jul 12, 2025

    CVE-2025-27591

    Open source ↗

Frequently asked(5)

What is CVE-2025-27591?
CVE-2025-27591 is a medium vulnerability published on March 11, 2025. 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.
When was CVE-2025-27591 disclosed?
CVE-2025-27591 was first published in the National Vulnerability Database on March 11, 2025, with the most recent update on July 3, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-27591 actively exploited?
CVE-2025-27591 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 28.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-27591?
CVE-2025-27591 has a CVSS v3 base score of 6.8 (NVD).
How do I remediate CVE-2025-27591?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-27591, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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