HIGH
privoxy: invalid read via empty host header in client request
Published Jan 27, 2016
7.5
HIGHCVSS 3.0
EPSS 2.87%
Description
The client_host function in parsers.c in Privoxy before 3.0.24 allows remote attackers to cause a denial of service (invalid read and crash) via an empty HTTP Host header.
Affected products
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
7.5 HIGH NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact High
5.0 MEDIUM NVD
AV:N/AC:L/Au:N/C:N/I:N/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
2.87% 0.02867
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.02867
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.87% (0.02867) | 86.30th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.81% (0.02813) | 84.64th | v5 (v2026.06.15) |
| Mar 30, 2025 | 1.81% (0.01815) | 81.23th | v4 (v2025.03.14) |
| Mar 29, 2025 | 3.65% (0.03654) | 79.54th | v4 (v2025.03.14) |
| Mar 17, 2025 | 2.06% (0.02064) | 82.71th | v4 (v2025.03.14) |
| Dec 17, 2024 | 4.13% (0.04134) | 92.08th | v3 (v2023.03.01) |
| Mar 7, 2023 | 3.05% (0.03052) | 89.43th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.32% (0.01319) | 71.27th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.32% (0.01319) | 71.23th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.32% (0.01319) | 69.22th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.32% (0.01319) | 44.98th | v2 (v2022.01.01) |
Weaknesses (2)
References (12)
- http://ijbswa.cvs.sourceforge.net/viewvc/ijbswa/current/parsers.c?r1=1.302&r2=1.303 x_refsource_CONFIRM
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/176475.html vendor-advisoryx_refsource_FEDORA
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/176492.html vendor-advisoryx_refsource_FEDORA
- http://seclists.org/oss-sec/2016/q1/173
- http://www.debian.org/security/2016/dsa-3460 vendor-advisoryx_refsource_DEBIAN
- http://www.openwall.com/lists/oss-security/2016/01/21/4 mailing-listx_refsource_MLIST
- http://www.openwall.com/lists/oss-security/2016/01/22/3 mailing-listx_refsource_MLIST
- http://www.privoxy.org/announce.txt x_refsource_CONFIRMVendor Advisory
- https://access.redhat.com/security/cve/CVE-2016-1983 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1300972 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2016-1983
- https://www.cve.org/CVERecord?id=CVE-2016-1983
| Link | Providers | Tags |
|---|---|---|
| http://ijbswa.cvs.sourceforge.net/viewvc/ijbswa/current/parsers.c?r1=1.302&r2=1.303 | x_refsource_CONFIRM | |
| http://lists.fedoraproject.org/pipermail/package-announce/2016-February/176475.html | vendor-advisoryx_refsource_FEDORA | |
| http://lists.fedoraproject.org/pipermail/package-announce/2016-February/176492.html | vendor-advisoryx_refsource_FEDORA | |
| http://seclists.org/oss-sec/2016/q1/173 | ||
| http://www.debian.org/security/2016/dsa-3460 | vendor-advisoryx_refsource_DEBIAN | |
| http://www.openwall.com/lists/oss-security/2016/01/21/4 | mailing-listx_refsource_MLIST | |
| http://www.openwall.com/lists/oss-security/2016/01/22/3 | mailing-listx_refsource_MLIST | |
| http://www.privoxy.org/announce.txt | x_refsource_CONFIRMVendor Advisory | |
| https://access.redhat.com/security/cve/CVE-2016-1983 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1300972 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2016-1983 | ||
| https://www.cve.org/CVERecord?id=CVE-2016-1983 |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Jan 27, 2016
Updated Aug 5, 2024
Reserved Jan 21, 2016
Link CVE-2016-1983
CISA Vulnrichment
Updated n/a