NVD / CVE Program· CNA mitre

CVE-2019-19825: On certain TOTOLINK Realtek SDK based routers, the CAPTCHA text can be retrieved via an {"topicurl":"setting/getSanvas"} POST to the boafrm/

Noroxi assessment

Priority: Plan (action score 48/100)

A ready-made attack module is public (Nuclei); exploiting it takes no special expertise.
Public proof-of-concept code exists (Exploit-DB / GitHub); there is no record of exploitation in the wild.
Probability of exploitation in the next 30 days: 29.5% (FIRST EPSS); higher than 98.1% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to the record, no fixed version is available yet.

Add it to your regular patch cycle. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

On certain TOTOLINK Realtek SDK based routers, the CAPTCHA text can be retrieved via an {"topicurl":"setting/getSanvas"} POST to the boafrm/formLogin URI, leading to a CAPTCHA bypass. (Also, the CAPTCHA text is not needed once the attacker has determined valid credentials. The attacker can perform router actions via HTTP requests with Basic Authentication.) This affects A3002RU through 2.0.0, A702R through 2.1.3, N301RT through 2.1.6, N302R through 3.4.0, N300RT through 3.4.0, N200RE through 4.0.0, N150RT through 3.4.0, and N100RE through 3.4.0.

CriticalCVSS 9.8 · v3.1—Proof of concept No fix recorded

Published: Jan 27, 2020
Updated: Jun 16, 2026
EPSS: 29.5% · 98th percentile
CWE: CWE-287

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Action score

Plan

Add it to your regular patch cycle.

CVSS: 39 / 40 · 9.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 9 / 30 · 29.5%

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Not in KEV: no record of exploitation in the wild
Proof of concept exists, no weaponized module
No fixed version yet

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
totolink	a3002ru firmware	cpe:2.3:o:totolink:a3002ru_firmware
totolink	a3002ru	cpe:2.3:h:totolink:a3002ru
totolink	a702r firmware	cpe:2.3:o:totolink:a702r_firmware
totolink	a702r	cpe:2.3:h:totolink:a702r
totolink	n301rt firmware	cpe:2.3:o:totolink:n301rt_firmware
totolink	n301rt	cpe:2.3:h:totolink:n301rt
totolink	n302r firmware	cpe:2.3:o:totolink:n302r_firmware
totolink	n302r	cpe:2.3:h:totolink:n302r
totolink	n300rt firmware	cpe:2.3:o:totolink:n300rt_firmware
totolink	n300rt	cpe:2.3:h:totolink:n300rt
totolink	n200re firmware	cpe:2.3:o:totolink:n200re_firmware
totolink	n200re	cpe:2.3:h:totolink:n200re

and 4 more

Affected versions

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

totolink a3002ru firmwareup to 2.0.0 inclusive
totolink a702r firmwareup to 2.1.3 inclusive
totolink n100re firmwareup to 3.4.0 inclusive
totolink n150rt firmwareup to 3.4.0 inclusive
totolink n200re firmwareup to 4.0.0 inclusive
totolink n300rt firmwareup to 3.4.0 inclusive
totolink n301rt firmwareup to 2.1.6 inclusive
totolink n302r firmwareup to 3.4.0 inclusive

Same product

totolink: all records

Other highest-scoring records for the same primary product.

CVE-2019-19824On certain TOTOLINK Realtek SDK based routers, an authenticated attacker may execute arbitrary OS commands via the sysCmd parameter to the b
43Plan
CVE-2018-13316System command injection in formAliasIp in TOTOLINK A3002RU version 1.0.8 allows attackers to execute system commands via the "subnet" POST
40Plan
CVE-2018-13314System command injection in formAliasIp in TOTOLINK A3002RU version 1.0.8 allows attackers to execute system commands via the "ipAddr" POST
40Plan

Published before and after this one in the same product

← EarlierCVE-2018-13306Nov 27, 2018 · System command injection in formDlna in TOTOLINK A3002RU version 1.0.8 allows attackers to execute system commands via the "ftpUser" POST pa
40Plan
← EarlierCVE-2018-13307Nov 27, 2018 · System command injection in fromNtp in TOTOLINK A3002RU version 1.0.8 allows attackers to execute system commands via the "ntpServerIp2" POS
40Plan
Later →CVE-2018-13313Feb 24, 2020 · Admin Password returned in password.htm
26Monitor

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

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

Nuclei detection template ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
Source	Kind	Date
Nuclei detection template	Nuclei template CVE-2019-19825	—

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.

No history yet (it accumulates with the daily EPSS job).

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

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-287 · Improper Authentication

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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

1app.use("/admin", requireSession, adminRouter);
2

3// Route added later skips the middleware
4app.post("/admin-api/config", updateConfig);

Fixed

1const admin = express.Router();
2admin.use(requireSession, requireRole("admin"));
3

4admin.post("/config", updateConfig);
5app.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.

Attack patterns (CAPEC)

ATT&CK techniques

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

packetstormsecurity.com/files/156083/Realtek-SDK-Information-Disclosure-Code-Execution.html

Show all references (2 more)

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

All records