Directory traversal vulnerability in the Local TFTP file-upload application on Cisco SRP 520 series devices with firmware before 1.1.26 and
Directory traversal vulnerability in the Local TFTP file-upload application on Cisco SRP 520 series devices with firmware before 1.1.26 and SRP 520W-U and 540 series devices with firmware before 1.2.4 allows remote authenticated users to upload software to arbitrary directories via unspecified vectors, aka Bug ID CSCtw56009.
- Published
- Feb 25, 2012
- Updated
- Jun 16, 2026
- EPSS
- 3.2% · 88th percentile
- CWE
- CWE-22
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Report tools
Action score
37
Monitor
Low priority for now.
- CVSS
- 36 / 40 · 9.0 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 3.2%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| cisco | small business srp520 series firmware | cpe:2.3:a:cisco:small_business_srp520_series_firmware |
| cisco | small business srp521w | cpe:2.3:h:cisco:small_business_srp521w |
| cisco | small business srp526w | cpe:2.3:h:cisco:small_business_srp526w |
| cisco | small business srp527w | cpe:2.3:h:cisco:small_business_srp527w |
| cisco | small business srp520-u series firmware | cpe:2.3:a:cisco:small_business_srp520-u_series_firmware |
| cisco | small business srp521w-u | cpe:2.3:h:cisco:small_business_srp521w-u |
| cisco | small business srp526w-u | cpe:2.3:h:cisco:small_business_srp526w-u |
| cisco | small business srp527w-u | cpe:2.3:h:cisco:small_business_srp527w-u |
| cisco | small business srp540 series firmware | cpe:2.3:a:cisco:small_business_srp540_series_firmware |
| cisco | small business srp541w | cpe:2.3:h:cisco:small_business_srp541w |
| cisco | small business srp546w | cpe:2.3:h:cisco:small_business_srp546w |
| cisco | small business srp547w | cpe:2.3:h:cisco:small_business_srp547w |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- cisco small business srp520 series firmwareup to 1.01.24 inclusive
- cisco small business srp520 series firmware1.01.01
- cisco small business srp520 series firmware1.01.09
- cisco small business srp520 series firmware1.01.11
- cisco small business srp520 series firmware1.01.19
- cisco small business srp520 series firmware1.01.23
- cisco small business srp520-u series firmware1.1.0
- cisco small business srp521wall versions
- cisco small business srp521w-uall versions
- cisco small business srp526wall versions
- cisco small business srp526w-uall versions
- cisco small business srp527wall versions
- cisco small business srp527w-uall versions
- cisco small business srp540 series firmwareup to 1.02.01 inclusive
- cisco small business srp540 series firmware1.02.00.023
- cisco small business srp541wall versions
- cisco small business srp546wall versions
- cisco small business srp547wall versions
Same product
cisco: all recordsOther highest-scoring records for the same primary product.
- CVE-2012-0363The web interface on Cisco SRP 520 series devices with firmware before 1.1.26 and SRP 520W-U and 540 series devices with firmware before 1.237Monitor
- CVE-2012-0364Cisco SRP 520 series devices with firmware before 1.1.26 and SRP 520W-U and 540 series devices with firmware before 1.2.4 allow remote attac31Monitor
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.
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 researchersFinders, 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
- C · data can be read
- Integrity
- C · data or configuration can be modified
- Availability
- C · the service can be disrupted
- Attack complexity
- Low
- Confidentiality impact
- C
- Integrity impact
- C
- Availability impact
- C
Weakness class (CWE)
CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')CVSS vector
AV:N/AC:L/Au:S/C:C/I:C/A:C
nvd-primary
Root cause
A user-supplied file name is joined with the allowed directory, but the result is never checked to confirm it is still inside that directory.
The bug in code
The whole CWE-22 classA representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.
Vulnerable
const file = path.join(ROOT, req.query.name);res.sendFile(file);Fixed
const file = path.resolve(ROOT, req.query.name);if (!file.startsWith(ROOT + path.sep)) { return res.sendStatus(400);}res.sendFile(file);Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Path TraversalCAPEC-126likelihood: High · Very High
- Using Slashes and URL Encoding Combined to Bypass Validation LogicCAPEC-64likelihood: High · High
- Manipulating Web Input to File System CallsCAPEC-76likelihood: High · Very High
- Using Escaped Slashes in Alternate EncodingCAPEC-78likelihood: High · High
- Using Slashes in Alternate EncodingCAPEC-79likelihood: High · High
ATT&CK techniques
—
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120223-srp500
- www.securitytracker.com/id?1026736
Vendor advisories and official records. Exploit/PoC links are deliberately left out.