CVE-2017-9856
** DISPUTED ** An issue was discovered in SMA Solar Technology products. Sniffed passwords from...
An issue was discovered in SMA Solar Technology products. Sniffed passwords from SMAdata2+ communication can be decrypted very easily. The passwords are "encrypted" using a very simple encryption algorithm. This enables an attacker to find the plaintext passwords and authenticate to the device. NOTE: the vendor reports that only Sunny Boy TLST-21 and TL-21 and Sunny Tripower TL-10 and TL-30 could potentially be affected
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List
An issue was discovered in SMA Solar Technology products. Sniffed passwords from SMAdata2+ communication can be decrypted very easily. The passwords are "encrypted" using a very simple encryption algorithm. This enables an attacker to find the plaintext passwords and authenticate to the device. NOTE: the vendor reports that only Sunny Boy TLST-21 and TL-21 and Sunny Tripower TL-10 and TL-30 could potentially be affected
- Record
CVE-2017-9856- CVSS 3.1
- 3.4 Low
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N - Weakness
- CWE-256
- Updated
- 2026-11-02
EUVDEUVD-2017-18766
An issue was discovered in SMA Solar Technology products. Sniffed passwords from SMAdata2+ communication can be decrypted very easily. The passwords are "encrypted" using a very simple encryption algorithm. This enables an attacker to find the plaintext passwords and authenticate to the device. NOTE: the vendor reports that only Sunny Boy TLST-21 and TL-21 and Sunny Tripower TL-10 and TL-30 could potentially be affected
- Record
EUVD-2017-18766- CVSS 3.1
- 3.4 Low
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-g5j9-p3rw-c77m
** DISPUTED ** An issue was discovered in SMA Solar Technology products. Sniffed passwords from...
** DISPUTED ** An issue was discovered in SMA Solar Technology products. Sniffed passwords from SMAdata2+ communication can be decrypted very easily. The passwords are "encrypted" using a very simple encryption algorithm. This enables an attacker to find the plaintext passwords and authenticate to the device. NOTE: the vendor reports that only Sunny Boy TLST-21 and TL-21 and Sunny Tripower TL-10 and TL-30 could potentially be affected.
- Record
GHSA-g5j9-p3rw-c77m- CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-256
- Updated
- 2026-11-02
NVD
An issue was discovered in SMA Solar Technology products. Sniffed passwords from SMAdata2+ communication can be decrypted very easily. The passwords are "encrypted" using a very simple encryption algorithm. This enables an attacker to find the plaintext passwords and authenticate to the device. NOTE: the vendor reports that only Sunny Boy TLST-21 and TL-21 and Sunny Tripower TL-10 and TL-30 could potentially be affected
- Record
CVE-2017-9856- CVSS 3.1
- 3.4 Low
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N - CVSS 3.0
- 9.8 Critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:P/I:N/A:N - Weakness
- CWE-256
- Updated
- 2026-11-02
Affected products
- sma sunny boy tlst-21
- sma sunny tripower tl-10
- sma sunny boy 1.5 firmware
- sma sunny boy 2.5 firmware
- sma sunny boy 3.0 firmware
- sma sunny boy 3.6 firmware
- sma sunny boy 3000tl firmware
- sma sunny boy 3600 firmware
- sma sunny boy 3600tl firmware
- sma sunny boy 4.0 firmware
- sma sunny boy 4000tl firmware
- sma sunny boy 5.0 firmware
Show 31 moreShow less
- sma sunny boy 5000 firmware
- sma sunny boy 5000tl firmware
- sma sunny boy storage 2.5 firmware
- sma sunny boy tl-21
- sma sunny central 1000cp xt firmware
- sma sunny central 2200 firmware
- sma sunny central 500cp xt firmware
- sma sunny central 630cp xt firmware
- sma sunny central 720cp xt firmware
- sma sunny central 760cp xt firmware
- sma sunny central 800cp xt firmware
- sma sunny central 850cp xt firmware
- sma sunny central 900cp xt firmware
- sma sunny central storage 1000 firmware
- sma sunny central storage 2200 firmware
- sma sunny central storage 2500-ev firmware
- sma sunny central storage 500 firmware
- sma sunny central storage 630 firmware
- sma sunny central storage 720 firmware
- sma sunny central storage 760 firmware
- sma sunny central storage 800 firmware
- sma sunny central storage 850 firmware
- sma sunny central storage 900 firmware
- sma sunny tripower 12000tl firmware
- sma sunny tripower 15000tl firmware
- sma sunny tripower 20000tl firmware
- sma sunny tripower 25000tl firmware
- sma sunny tripower 5000tl firmware
- sma sunny tripower 60 firmware
- sma sunny tripower core1 firmware
- sma sunny tripower tl-30
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2017-9856 is a critical vulnerability (CVSS 9.8) in Sma Sunny Boy Tlst-21, published August 5, 2017. Its validity is disputed. EPSS puts the chance of exploitation in the next 30 days at 0.66%, the 51st percentile.