CVE-2020-13391

highpriority · track · 40EPSS 0.026 · 85 %ileEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

2.55% (85th) EPSS

CVSS 7.5 · high

Is it mine?

6 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-27

An issue was discovered on Tenda AC6 V1.0 V15.03.05.19_multi_TD01, AC9 V1.0 V15.03.05.19(6318)_CN, AC9 V3.0 V15.03.06.42_multi, AC15 V1.0 V15.03.05.19_multi_TD01, and AC18 V15.03.05.19(6318_)_CN devices. There is a buffer overflow vulnerability in the router's web server -- httpd. While processing the /goform/SetSpeedWan speed_dir parameter for a POST request, a value is directly used in a sprintf to a local variable placed on the stack, which overwrites the return address of a function. An attacker can construct a payload to carry out arbitrary code execution attacks.

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-120USprimary

affected products (6)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
tendacn ac15 firmware= v15.03.05.19_multi_td01nvdUScpe:2.3:o:tendacn:ac15_firmware:*:*:*:*:*:*:*:*
tendacn ac18 firmware= v15.03.05.19(6318)nvdUScpe:2.3:o:tendacn:ac18_firmware:*:*:*:*:*:*:*:*
tendacn ac6 firmware= v15.03.05.19_multi_td01nvdUScpe:2.3:o:tendacn:ac6_firmware:*:*:*:*:*:*:*:*
tendacn ac9 firmware= v15.03.05.19(6318)nvdUScpe:2.3:o:tendacn:ac9_firmware:*:*:*:*:*:*:*:*
tendacn ac9 firmware= v15.03.06.42_multinvdUScpe:2.3:o:tendacn:ac9_firmware:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2020-05-22modified 2026-06-17

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+5664 more

references (7)

External citations — patches, advisories, analysis.

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