curl: Integer overflow leading to heap-based buffer overflow in Curl_sasl_create_plain_message()
Published Oct 31, 2018
9.8
CRITICALCVSS 3.0
EPSS 5.78%
Description
Curl versions 7.33.0 through 7.61.1 are vulnerable to a buffer overrun in the SASL authentication code that may lead to denial of service.
Affected products
-
- Version from 7.33.0 to 7.61.1StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| The Curl Project | Curl: | n/a |
|
Configuration 2
- 8.0
- 9.0
Configuration 3
- 14.04
- 16.04
- 18.04
- 18.10
No data.
JBoss Core Services Apache HTTP Server 2.4.29 SP2
n/a
Fixed · RHSA-2019:1543
.NET Core 1.0 on Red Hat Enterprise Linux
rh-dotnetcore10-curl
Out of support scope
.NET Core 1.1 on Red Hat Enterprise Linux
rh-dotnetcore11-curl
Out of support scope
.NET Core 2.1 on Red Hat Enterprise Linux
rh-dotnet21-curl
Out of support scope
Red Hat Enterprise Linux 5
curl
Not affected
Red Hat Enterprise Linux 6
curl
Not affected
Red Hat Enterprise Linux 7
curl
Not affected
Red Hat Enterprise Linux 8
curl
Not affected
Red Hat JBoss Core Services
jbcs-httpd24-curl
Affected
Red Hat JBoss Web Server 5
curl
Not affected
Red Hat Software Collections
httpd24-curl
Fix deferred
| Product | Package | State | Advisory |
|---|---|---|---|
| JBoss Core Services Apache HTTP Server 2.4.29 SP2 | n/a | Fixed | RHSA-2019:1543 |
| .NET Core 1.0 on Red Hat Enterprise Linux | rh-dotnetcore10-curl | Out of support scope | n/a |
| .NET Core 1.1 on Red Hat Enterprise Linux | rh-dotnetcore11-curl | Out of support scope | n/a |
| .NET Core 2.1 on Red Hat Enterprise Linux | rh-dotnet21-curl | Out of support scope | n/a |
| Red Hat Enterprise Linux 5 | curl | Not affected | n/a |
| Red Hat Enterprise Linux 6 | curl | Not affected | n/a |
| Red Hat Enterprise Linux 7 | curl | Not affected | n/a |
| Red Hat Enterprise Linux 8 | curl | Not affected | n/a |
| Red Hat JBoss Core Services | jbcs-httpd24-curl | Affected | n/a |
| Red Hat JBoss Web Server 5 | curl | Not affected | n/a |
| Red Hat Software Collections | httpd24-curl | Fix deferred | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
AV:N/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Apr 15, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 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 (30 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 5.78% (0.05782) | 92.86th | v5 (v2026.06.15) |
| Sep 22, 2026 | 5.78% (0.05782) | 92.76th | v5 (v2026.06.15) |
| Sep 21, 2026 | 4.70% (0.04700) | 91.41th | v5 (v2026.06.15) |
| Sep 6, 2026 | 5.78% (0.05782) | 92.60th | v5 (v2026.06.15) |
| Sep 5, 2026 | 4.70% (0.04700) | 91.22th | v5 (v2026.06.15) |
| Aug 30, 2026 | 5.78% (0.05782) | 92.56th | v5 (v2026.06.15) |
| Aug 28, 2026 | 4.70% (0.04700) | 91.17th | v5 (v2026.06.15) |
| Aug 24, 2026 | 5.78% (0.05782) | 92.51th | v5 (v2026.06.15) |
| Aug 23, 2026 | 4.70% (0.04700) | 91.14th | v5 (v2026.06.15) |
| Jun 15, 2026 | 5.83% (0.05830) | 92.17th | v5 (v2026.06.15) |
| Nov 21, 2025 | 0.29% (0.00293) | 52.30th | v4 (v2025.03.14) |
| Nov 18, 2025 | 5.38% (0.05383) | 89.12th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.35% (0.00351) | 55.40th | v4 (v2025.03.14) |
| Dec 17, 2024 | 0.77% (0.00771) | 81.08th | v3 (v2023.03.01) |
| Jun 19, 2024 | 1.57% (0.01575) | 87.36th | v3 (v2023.03.01) |
| May 2, 2024 | 1.12% (0.01116) | 84.41th | v3 (v2023.03.01) |
| Mar 23, 2024 | 1.08% (0.01076) | 83.95th | v3 (v2023.03.01) |
| Nov 8, 2023 | 1.92% (0.01919) | 87.25th | v3 (v2023.03.01) |
| Oct 25, 2023 | 1.02% (0.01022) | 82.12th | v3 (v2023.03.01) |
| Aug 1, 2023 | 0.79% (0.00793) | 79.33th | v3 (v2023.03.01) |
| Jul 8, 2023 | 0.87% (0.00867) | 80.12th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.07% (0.01070) | 81.95th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.54% (0.01537) | 74.52th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.54% (0.01537) | 74.48th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.54% (0.01537) | 72.41th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.54% (0.01537) | 51.33th | v2 (v2022.01.01) |
| Feb 3, 2022 | 2.57% (0.02567) | 55.02th | v1 |
| Jan 6, 2022 | 2.57% (0.02567) | 54.58th | v1 |
| Sep 1, 2021 | 2.57% (0.02567) | 78.88th | v1 |
| Apr 14, 2021 | 2.57% (0.02567) | 0.00th | v1 |
References (13)
- http://www.securitytracker.com/id/1042012 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2018-16839 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1642201 Issue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16839 x_refsource_CONFIRMIssue TrackingThird Party Advisory
- https://curl.haxx.se/docs/CVE-2018-16839.html x_refsource_MISCPatchVendor Advisory
- https://github.com/curl/curl/commit/f3a24d7916b9173c69a3e0ee790102993833d6c5 x_refsource_CONFIRMPatchThird Party Advisory
- https://lists.apache.org/thread.html/8338a0f605bdbb3a6098bb76f666a95fc2b2f53f37fa1ecc89f1146f%40%3Cdevnull.infra.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.debian.org/debian-lts-announce/2018/11/msg00005.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2018-16839
- https://security.gentoo.org/glsa/201903-03 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://usn.ubuntu.com/3805-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2018-16839
- https://www.debian.org/security/2018/dsa-4331 vendor-advisoryx_refsource_DEBIANThird Party Advisory
Change history (4)
- MITRE
- CVSS vector changed from CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L to
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L → CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
- CVSS score changed from 5 to
4.3 5 → 4.3
- CVSS vector changed from CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L to
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
- REDHAT
- CVSS vector changed from CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L to
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L → CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
- CVSS score changed from 4.3 to
5 4.3 → 5
- CVSS vector changed from CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L to
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L