Security readout for executives and security teams
Plain-English summary
CVE-2021-47208 is a denial-of-service issue in Mojolicious before 9.11. A user with some level of access could potentially trigger excessive resource use through a format-detection bug, reducing application availability. The public bundle does not show data theft, code execution, or confirmed exploitation.
Executive priority
Treat this as a moderate availability risk. Prioritize internet-facing or business-critical Perl services, but it should not displace urgent remediation for exploited or code-execution vulnerabilities.
Technical view
The CVE describes a CWE-400 resource-consumption flaw in Mojolicious format detection before version 9.11. CVSS 3.1 is 4.3: network-reachable, low complexity, privileges required, no user interaction, unchanged scope, and low availability impact only.
Likely exposure
Exposure is most likely in Perl applications using Mojolicious versions earlier than 9.11, especially where authenticated users can reach affected request handling paths. The source bundle provides no CPEs or detailed product inventory mapping.
Exploitation context
The bundle states potential denial of service only. It is not listed as KEV, and the provided sources do not show active exploitation or public weaponization details.
Researcher notes
Evidence is limited: the CVE record names Mojolicious before 9.11 and links an issue and commit, but affected vendor/product/CPE fields are not populated. Avoid broad product claims without local dependency evidence.
Mitigation direction
- Inventory Perl applications that depend on Mojolicious.
- Upgrade Mojolicious to 9.11 or later where applicable.
- Review vendor project guidance and the referenced fix commit.
- Apply rate limits or resource controls for exposed authenticated routes.
- Monitor application availability and abnormal resource consumption.
Validation and detection
- Check dependency manifests and deployed module versions for Mojolicious before 9.11.
- Confirm whether exposed applications require authenticated access to relevant routes.
- Review logs for unusual request patterns and availability degradation.
- Run regression tests around request format handling after upgrade.
- Document exceptions where upgrade timing requires compensating controls.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-400: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-47208 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/mojolicious/mojo/issues/1736CVE reference
- https://github.com/mojolicious/mojo/commit/a0c4576ffb11c235088550de9ba7ac4196e1953cCVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.