cyrus-sasl: denial of service in _sasl_add_string function
Published Dec 19, 2019
7.5
HIGHCVSS 3.1
EPSS 8.04%
Description
cyrus-sasl (aka Cyrus SASL) 2.1.27 has an out-of-bounds write leading to unauthenticated remote denial-of-service in OpenLDAP via a malformed LDAP packet. The OpenLDAP crash is ultimately caused by an off-by-one error in _sasl_add_string in common.c in cyrus-sasl.
Affected products
No data.
Configuration 1
- < 2.1.28
Configuration 2
- 8.0
- 9.0
- 10.0
Configuration 3
- 12.04
- 14.04
- 16.04
- 18.04
- 19.10
Configuration 4
- 31
- 32
Configuration 5
- 2.0.0
- 10.14.6
- 5.0
- 6.0
- 7.0
- 8.0
- 8.4
- 8.0
- 8.4
- 8.0
- 8.4
- 8.4
- 8.4
- 8.4
- 8.4
Configuration 6
- 13.6
- 13.6
- < 10.13.6
- ≥ 10.13.0 · < 10.13.6
- ≥ 10.15.0 · < 10.15.6
- 10.13.6
- 10.13.6
- 10.13.6
- 10.13.6
- 10.13.6
- 10.13.6
- 10.13.6
- 10.13.6
- 10.13.6
- 10.13.6
- 10.13.6
- 10.13.6
- 10.13.6
- 10.14.6
- 10.14.6
- 10.14.6
- 10.14.6
- 10.14.6
- 10.14.6
- 10.14.6
- 10.14.6
- 10.14.6
Configuration 7
- 4.12.1
No data.
Red Hat Enterprise Linux 8
cyrus-sasl-0:2.1.27-5.el8
Fixed · RHSA-2020:4497
Red Hat Enterprise Linux 8
cyrus-sasl-0:2.1.27-5.el8
Fixed · RHSA-2020:4497
Red Hat Enterprise Linux 5
cyrus-sasl
Out of support scope
Red Hat Enterprise Linux 6
cyrus-sasl
Out of support scope
Red Hat Enterprise Linux 7
cyrus-sasl
Will not fix
Red Hat JBoss Enterprise Web Server 2
cyrus-sasl
Out of support scope
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 8 | cyrus-sasl-0:2.1.27-5.el8 | Fixed | RHSA-2020:4497 |
| Red Hat Enterprise Linux 8 | cyrus-sasl-0:2.1.27-5.el8 | Fixed | RHSA-2020:4497 |
| Red Hat Enterprise Linux 5 | cyrus-sasl | Out of support scope | n/a |
| Red Hat Enterprise Linux 6 | cyrus-sasl | Out of support scope | n/a |
| Red Hat Enterprise Linux 7 | cyrus-sasl | Will not fix | n/a |
| Red Hat JBoss Enterprise Web Server 2 | cyrus-sasl | Out of support scope | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (24 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 8.04% (0.08036) | 94.62th | v5 (v2026.06.15) |
| Jun 15, 2026 | 8.04% (0.08036) | 94.03th | v5 (v2026.06.15) |
| Nov 21, 2025 | 0.40% (0.00396) | 59.69th | v4 (v2025.03.14) |
| Nov 18, 2025 | 4.26% (0.04256) | 87.69th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.23% (0.00228) | 43.54th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.51% (0.00506) | 77.26th | v3 (v2023.03.01) |
| Jun 16, 2024 | 0.51% (0.00506) | 76.56th | v3 (v2023.03.01) |
| May 1, 2024 | 0.69% (0.00685) | 79.84th | v3 (v2023.03.01) |
| Apr 13, 2024 | 0.66% (0.00656) | 79.20th | v3 (v2023.03.01) |
| Mar 29, 2024 | 0.58% (0.00585) | 77.73th | v3 (v2023.03.01) |
| Nov 25, 2023 | 0.65% (0.00650) | 77.09th | v3 (v2023.03.01) |
| Nov 9, 2023 | 0.56% (0.00560) | 75.03th | v3 (v2023.03.01) |
| Nov 8, 2023 | 0.44% (0.00436) | 71.77th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.20% (0.00196) | 55.65th | v3 (v2023.03.01) |
| Mar 6, 2023 | 5.24% (0.05242) | 89.75th | v2 (v2022.01.01) |
| Apr 13, 2022 | 5.24% (0.05242) | 88.75th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.69% (0.02686) | 81.17th | v2 (v2022.01.01) |
| Feb 4, 2022 | 23.44% (0.23437) | 94.77th | v2 (v2022.01.01) |
| Feb 3, 2022 | 12.48% (0.12481) | 88.86th | v1 |
| Jan 6, 2022 | 12.48% (0.12481) | 88.73th | v1 |
| Sep 1, 2021 | 3.08% (0.03080) | 81.27th | v1 |
| Jun 30, 2021 | 3.08% (0.03080) | 0.00th | v1 |
| Jun 29, 2021 | 2.88% (0.02880) | 0.00th | v1 |
| Apr 14, 2021 | 2.68% (0.02678) | 0.00th | v1 |
References (19)
- http://seclists.org/fulldisclosure/2020/Jul/23 mailing-listx_refsource_FULLDISCMailing ListThird Party Advisory
- http://seclists.org/fulldisclosure/2020/Jul/24 mailing-listx_refsource_FULLDISCMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2022/02/23/4 mailing-listx_refsource_MLISTMailing ListPatchRelease NotesThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2019-19906 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1791854 Issue Tracking
- https://github.com/cyrusimap/cyrus-sasl/issues/587 x_refsource_MISCPatchThird Party Advisory
- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.debian.org/debian-lts-announce/2019/12/msg00027.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MW6GZCLECGL2PBNHVNPJIX4RPVRVFR7R/ vendor-advisoryx_refsource_FEDORA
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OB4GSVOJ6ESHQNT5GSV63OX5D4KPSTGT/ vendor-advisoryx_refsource_FEDORA
- https://nvd.nist.gov/vuln/detail/CVE-2019-19906
- https://seclists.org/bugtraq/2019/Dec/42 mailing-listx_refsource_BUGTRAQMailing ListThird Party Advisory
- https://support.apple.com/kb/HT211288 x_refsource_CONFIRMThird Party Advisory
- https://support.apple.com/kb/HT211289 x_refsource_CONFIRMThird Party Advisory
- https://usn.ubuntu.com/4256-1/ vendor-advisoryx_refsource_UBUNTUPatchThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2019-19906
- https://www.debian.org/security/2019/dsa-4591 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.openldap.org/its/index.cgi/Incoming?id=9123 x_refsource_MISCExploitThird Party Advisory
Change history (0)
No recorded changes yet.