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CVE-2011-1409· NVD / CVE Program· CNA mitre

Frams's Fast File EXchange (F*EX, aka fex) 20100208, and possibly other versions before 20110610, allows remote attackers to bypass authenti

Frams's Fast File EXchange (F*EX, aka fex) 20100208, and possibly other versions before 20110610, allows remote attackers to bypass authentication and upload arbitrary files via a request that lacks an authentication ID.

MediumCVSS 5.0 · v2.0—No exploit Fix available
Published
Jun 24, 2011
Updated
Jun 16, 2026
EPSS
2.3% · 83th percentile
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Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
20 / 40 · 5.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.3%

Affected systems

VendorProduct
ulli horlacherfex

Affected versions

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

  • ulli horlacher fex20100208

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12fexbefore 20110610-120110610-1
Debian:6.0fexbefore 20100208+debian1-1+squeeze120100208+debian1-1+squeeze1

Same product

ulli horlacher: all records

Other highest-scoring records for the same primary product.

  • CVE-2014-3875The addto parameter to fup in Frams' Fast File EXchange (F*EX, aka fex) before fex-2014053 allows remote attackers to conduct cross-site scr
    25Monitor
  • CVE-2014-3877Incomplete blacklist vulnerability in Frams' Fast File EXchange (F*EX, aka fex) before fex-20140530 allows remote attackers to conduct cross
    18Monitor
  • CVE-2014-3876Multiple cross-site scripting (XSS) vulnerabilities in Frams' Fast File EXchange (F*EX, aka fex) before fex-20140530 allow remote attackers
    18Monitor
  • CVE-2012-1293Multiple cross-site scripting (XSS) vulnerabilities in fup in Frams' Fast File EXchange (F*EX, aka fex) before 20111129-2 allow remote attac
    18Monitor
  • CVE-2012-0869Cross-site scripting (XSS) vulnerability in fup in Frams' Fast File EXchange (F*EX, aka fex) before 20120215 allows remote attackers to inje
    18Monitor

Remediation

Which version to upgrade to

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

Product / packageFixed versionSource
debian:fex20110610-1 · Debian:12Package registry (OSV)

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.

—

Bug bounty scope

No known public program.

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

Technical details

Attack conditions

  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
P · data or configuration can be modified
Availability
none
Attack complexity
Low
Confidentiality impact
None
Integrity impact
P
Availability impact
None

Weakness class (CWE)

CWE-287 · Improper Authentication

CVSS vector

AV:N/AC:L/Au:N/C:N/I:P/A:N

nvd-primary

Root cause

Authentication is added route by route instead of being enforced in one place. When a route added later bypasses the shared middleware, the session check never runs for it.

The bug in code

The whole CWE-287 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
app.use("/admin", requireSession, adminRouter);
// Route added later skips the middlewareapp.post("/admin-api/config", updateConfig);

Fixed

ts
const admin = express.Router();admin.use(requireSession, requireRole("admin"));
admin.post("/config", updateConfig);app.use("/admin", admin);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Noroxi analysis

No Noroxi analysis for this record yet

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Change log

  1. Fix✗ → ✓

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References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records