CVE-2021-40883· NVD / CVE Program· CNA mitre

A Remote Code Execution (RCE) vulnerability exists in emlog 5.3.1 via content/plugins.

CriticalCVSS 9.8 · v3.1—No exploit No fix recorded

Published: Dec 14, 2021
Updated: Jun 17, 2026
EPSS: 3.0% · 87th percentile
CWE: CWE-434

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Plan

Add it to your regular patch cycle.

CVSS: 39 / 40 · 9.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 1 / 30 · 3.0%

Noroxi analysis

No Noroxi analysis for this record yet

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Affected systems

Vendor	Product	CPE
emlog	emlog	cpe:2.3:a:emlog:emlog

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

emlog emlog5.3.1

Same product

emlog: all records

Other highest-scoring records for the same primary product.

CVE-2023-44974An arbitrary file upload vulnerability in the component /admin/plugin.php of Emlog Pro v2.2.0 allows attackers to execute arbitrary code via
45Plan
CVE-2026-42287Emlog: SQL Injection Vulnerability in log_model.php within addLog() and updateLog() Functions
40Plan
CVE-2023-43291Deserialization of Untrusted Data in emlog pro v.2.1.15 and earlier allows a remote attacker to execute arbitrary code via the cache.php com
40Plan
CVE-2021-31737emlog v5.3.1 and emlog v6.0.0 have a Remote Code Execution vulnerability due to upload of database backup file in admin/data.php.
40Plan
CVE-2020-21585Vulnerability in emlog v6.0.0 allows user to upload webshells via zip plugin module.
40Plan
CVE-2019-16868emlog through 6.0.0beta has an arbitrary file deletion vulnerability via an admin/data.php?action=dell_all_bak request with directory traver
40Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).