CVE-2021-1725
Bot Framework SDK Information Disclosure Vulnerability
Bot Framework SDK Information Disclosure Vulnerability
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Bot Framework SDK Information Disclosure Vulnerability
Bot Framework SDK Information Disclosure Vulnerability
- Record
CVE-2021-1725- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C - Updated
- 2026-11-02
EUVDEUVD-2021-0037
Bot Framework SDK Information Disclosure Vulnerability
- Record
EUVD-2021-0037- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-cqff-fx2x-p86v
botframework-connector vulnerable to Improper Authentication
Impact
A maliciously crafted claim may be incorrectly authenticated by the bot. Impacts bots that are not configured to be used as a Skill. This vulnerability requires an attacker to have internal knowledge of the bot.
Patches
The problem has been patched in all affected versions. Please see the list of patched versions for the most appropiate one for your individual case.
Workarounds
Users who do not wish or are not able to upgrade can add an authentication configuration containing ClaimsValidator, which throws an exception if Claims are Skill Claims.
For detailed instructions, see the link in the References section.
For more information
If you have any questions or comments about this advisory:
- Open an issue in Microsoft Bot Builder SDK
- Email us at [email protected]
- Record
GHSA-cqff-fx2x-p86v- CVSS 4.0
- 8.2 High
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N - Weakness
- CWE-287
- Updated
- 2026-11-02
GitHub AdvisoriesGHSA-fvcj-hvfw-7f2v
botframework-connector vulnerable to Improper Authentication
Impact
A maliciously crafted claim may be incorrectly authenticated by the bot. Impacts bots that are not configured to be used as a Skill. This vulnerability requires an attacker to have internal knowledge of the bot.
Patches
The problem has been patched in all affected versions. Please see the list of patched versions for the most appropriate one for your individual case.
Workarounds
Users who do not wish or are not able to upgrade can add an authentication configuration containing ClaimsValidator, which throws an exception if the Claims are Skill Claims.
For detailed instructions, see the link in the References section.
For more information
If you have any questions or comments about this advisory:
- Open an issue in Microsoft Bot Builder SDK
- Email us at [email protected]
- Record
GHSA-fvcj-hvfw-7f2v- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-200, CWE-287
- Updated
- 2026-11-02
NVD
Bot Framework SDK Information Disclosure Vulnerability
- Record
CVE-2021-1725- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - CVSS 2.0
- 2.1 Low
AV:L/AC:L/Au:N/C:P/I:N/A:N - Weakness
- CWE-287
- Updated
- 2026-11-02
OSVGHSA-cqff-fx2x-p86v
botframework-connector vulnerable to Improper Authentication
Impact
A maliciously crafted claim may be incorrectly authenticated by the bot. Impacts bots that are not configured to be used as a Skill. This vulnerability requires an attacker to have internal knowledge of the bot.
Patches
The problem has been patched in all affected versions. Please see the list of patched versions for the most appropiate one for your individual case.
Workarounds
Users who do not wish or are not able to upgrade can add an authentication configuration containing ClaimsValidator, which throws an exception if Claims are Skill Claims.
For detailed instructions, see the link in the References section.
For more information
If you have any questions or comments about this advisory:
- Open an issue in Microsoft Bot Builder SDK
- Email us at [email protected]
- Record
GHSA-cqff-fx2x-p86v- CVSS 4.0
- 8.2 High
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N - Weakness
- CWE-287
- Updated
- 2026-11-02
OSVGHSA-fvcj-hvfw-7f2v
botframework-connector vulnerable to Improper Authentication
Impact
A maliciously crafted claim may be incorrectly authenticated by the bot. Impacts bots that are not configured to be used as a Skill. This vulnerability requires an attacker to have internal knowledge of the bot.
Patches
The problem has been patched in all affected versions. Please see the list of patched versions for the most appropriate one for your individual case.
Workarounds
Users who do not wish or are not able to upgrade can add an authentication configuration containing ClaimsValidator, which throws an exception if the Claims are Skill Claims.
For detailed instructions, see the link in the References section.
For more information
If you have any questions or comments about this advisory:
- Open an issue in Microsoft Bot Builder SDK
- Email us at [email protected]
- Record
GHSA-fvcj-hvfw-7f2v- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-200, CWE-287
- Updated
- 2026-11-02
OSVPYSEC-2021-422 No score
Bot Framework SDK Information Disclosure Vulnerability
- Record
PYSEC-2021-422- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
botframework-connectorPyPI |
4.7.0 up to 4.7.2 | 4.7.2 |
botframework-connectorPyPI |
4.8.0 to 4.8.0 | 4.8.1 |
botframework-connectorPyPI |
4.9.0 up to 4.9.3 | 4.9.3 |
botframework-connectorPyPI |
4.10.0 to 4.10.0 | 4.10.1 |
botframework-connectornpm |
4.7.0 up to 4.7.3 | 4.7.3 |
botframework-connectornpm |
4.8.0 to 4.8.0 | 4.8.1 |
botframework-connectornpm |
4.9.0 up to 4.9.4 | 4.9.4 |
botframework-connectornpm |
4.10.0 up to 4.10.3 | 4.10.3 |
botframework-connectorPyPI |
4.7.0 up to 4.7.2, plus listed versions 4.7.1 |
4.7.2 |
botframework-connectorPyPI |
4.8.0 up to 4.8.1 | 4.8.1 |
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| Package | Affected | Fixed |
|---|---|---|
botframework-connectorPyPI |
4.9.0 up to 4.9.3, plus listed versions 4.9.14.9.2 |
4.9.3 |
botframework-connectorPyPI |
4.10.0 up to 4.10.1 | 4.10.1 |
botframework-connectornpm |
4.8.0 up to 4.8.1 | 4.8.1 |
botframework-connectorPyPI |
4.7.0 up to 4.7.2, 4.8.0 up to 4.8.1, 4.9.0 up to 4.9.3, 4.10.0 up to 4.10.1, plus listed versions 4.7.14.9.14.9.2 |
4.7.24.8.14.9.34.10.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-1725 is a medium vulnerability (CVSS 5.5) in Microsoft Bot Framework Sdk For .net Framework, published January 12, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.07%, the 65th percentile. Fixed in botframework-connector 4.7.2.
References
msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1725
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1725
github.com/microsoft/botbuilder-python/security/advisories/GHSA-cqff-fx2x-p86v
pypi.org/project/botframework-connector
Show 7 moreShow less
aka.ms/SkillClaimsValidationJavascript
npmjs.com/package/botframework-connector
nvd.nist.gov/vuln/detail/CVE-2021-1725