Multiple integer overflows in pktlength.c in Chrony before 1.29 allow remote attackers to…
Priority LOW 29CWE-189Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · Partial
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA. Impact type from CWE-189 and the CVSS impact.
Summary
Multiple integer overflows in pktlength.c in Chrony before 1.29 allow remote attackers to cause a denial of service (crash) via a crafted (1) REQ_SUBNETS_ACCESSED or (2) REQ_CLIENT_ACCESSES command request to the PKL_CommandLength function or crafted (3) RPY_SUBNETS_ACCESSED, (4) RPY_CLIENT_ACCESSES, (5) RPY_CLIENT_ACCESSES_BY_INDEX, or (6) RPY_MANUAL_LIST command reply to the PKL_ReplyLength function, which triggers an out-of-bounds read or buffer overflow. NOTE: versions 1.27 and 1.28 do not require authentication to exploit.
Why it matters now
EPSS 0.03244 88th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 24
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:tuxfamily:chrony:*:*:*:*:*:*:*:* | up to 1.28 | Vulnerable | Tuxfamily |
| cpe:2.3:a:tuxfamily:chrony:1.0:*:*:*:*:*:*:* | 1.0 | Vulnerable | Tuxfamily |
| cpe:2.3:a:tuxfamily:chrony:1.1:*:*:*:*:*:*:* | 1.1 | Vulnerable | Tuxfamily |
| cpe:2.3:a:tuxfamily:chrony:1.18:*:*:*:*:*:*:* | 1.18 | Vulnerable | Tuxfamily |
| cpe:2.3:a:tuxfamily:chrony:1.19:*:*:*:*:*:*:* | 1.19 | Vulnerable | Tuxfamily |
| cpe:2.3:a:tuxfamily:chrony:1.19.99.1:*:*:*:*:*:*:* | 1.19.99.1 | Vulnerable | Tuxfamily |
| cpe:2.3:a:tuxfamily:chrony:1.19.99.2:*:*:*:*:*:*:* | 1.19.99.2 | Vulnerable | Tuxfamily |
| cpe:2.3:a:tuxfamily:chrony:1.19.99.3:*:*:*:*:*:*:* | 1.19.99.3 | Vulnerable | Tuxfamily |
| cpe:2.3:a:tuxfamily:chrony:1.20:*:*:*:*:*:*:* | 1.20 | Vulnerable | Tuxfamily |
| cpe:2.3:a:tuxfamily:chrony:1.21:*:*:*:*:*:*:* | 1.21 | Vulnerable | Tuxfamily |
- cpe:2.3:a:tuxfamily:chrony:*:*:*:*:*:*:*:* Versions up to 1.28 Vulnerable ·Tuxfamily
- cpe:2.3:a:tuxfamily:chrony:1.0:*:*:*:*:*:*:* Versions 1.0 Vulnerable ·Tuxfamily
- cpe:2.3:a:tuxfamily:chrony:1.1:*:*:*:*:*:*:* Versions 1.1 Vulnerable ·Tuxfamily
- cpe:2.3:a:tuxfamily:chrony:1.18:*:*:*:*:*:*:* Versions 1.18 Vulnerable ·Tuxfamily
- cpe:2.3:a:tuxfamily:chrony:1.19:*:*:*:*:*:*:* Versions 1.19 Vulnerable ·Tuxfamily
- cpe:2.3:a:tuxfamily:chrony:1.19.99.1:*:*:*:*:*:*:* Versions 1.19.99.1 Vulnerable ·Tuxfamily
- cpe:2.3:a:tuxfamily:chrony:1.19.99.2:*:*:*:*:*:*:* Versions 1.19.99.2 Vulnerable ·Tuxfamily
- cpe:2.3:a:tuxfamily:chrony:1.19.99.3:*:*:*:*:*:*:* Versions 1.19.99.3 Vulnerable ·Tuxfamily
- cpe:2.3:a:tuxfamily:chrony:1.20:*:*:*:*:*:*:* Versions 1.20 Vulnerable ·Tuxfamily
- cpe:2.3:a:tuxfamily:chrony:1.21:*:*:*:*:*:*:* Versions 1.21 Vulnerable ·Tuxfamily
Show 14 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:tuxfamily:chrony:1.21:pre1:*:*:*:*:*:* | 1.21 pre1 | Vulnerable | Tuxfamily |
| cpe:2.3:a:tuxfamily:chrony:1.23:*:*:*:*:*:*:* | 1.23 | Vulnerable | Tuxfamily |
| cpe:2.3:a:tuxfamily:chrony:1.23:pre1:*:*:*:*:*:* | 1.23 pre1 | Vulnerable | Tuxfamily |
| cpe:2.3:a:tuxfamily:chrony:1.23.1:*:*:*:*:*:*:* | 1.23.1 | Vulnerable | Tuxfamily |
| cpe:2.3:a:tuxfamily:chrony:1.24:*:*:*:*:*:*:* | 1.24 | Vulnerable | Tuxfamily |
| cpe:2.3:a:tuxfamily:chrony:1.24:pre1:*:*:*:*:*:* | 1.24 pre1 | Vulnerable | Tuxfamily |
| cpe:2.3:a:tuxfamily:chrony:1.25:*:*:*:*:*:*:* | 1.25 | Vulnerable | Tuxfamily |
| cpe:2.3:a:tuxfamily:chrony:1.25:pre1:*:*:*:*:*:* | 1.25 pre1 | Vulnerable | Tuxfamily |
| cpe:2.3:a:tuxfamily:chrony:1.25:pre2:*:*:*:*:*:* | 1.25 pre2 | Vulnerable | Tuxfamily |
| cpe:2.3:a:tuxfamily:chrony:1.26:*:*:*:*:*:*:* | 1.26 | Vulnerable | Tuxfamily |
| cpe:2.3:a:tuxfamily:chrony:1.26:pre1:*:*:*:*:*:* | 1.26 pre1 | Vulnerable | Tuxfamily |
| cpe:2.3:a:tuxfamily:chrony:1.27:*:*:*:*:*:*:* | 1.27 | Vulnerable | Tuxfamily |
| cpe:2.3:a:tuxfamily:chrony:1.27:pre1:*:*:*:*:*:* | 1.27 pre1 | Vulnerable | Tuxfamily |
| cpe:2.3:a:tuxfamily:chrony:1.28:pre1:*:*:*:*:*:* | 1.28 pre1 | Vulnerable | Tuxfamily |
- cpe:2.3:a:tuxfamily:chrony:1.21:pre1:*:*:*:*:*:* Versions 1.21 pre1 Vulnerable ·Tuxfamily
- cpe:2.3:a:tuxfamily:chrony:1.23:*:*:*:*:*:*:* Versions 1.23 Vulnerable ·Tuxfamily
- cpe:2.3:a:tuxfamily:chrony:1.23:pre1:*:*:*:*:*:* Versions 1.23 pre1 Vulnerable ·Tuxfamily
- cpe:2.3:a:tuxfamily:chrony:1.23.1:*:*:*:*:*:*:* Versions 1.23.1 Vulnerable ·Tuxfamily
- cpe:2.3:a:tuxfamily:chrony:1.24:*:*:*:*:*:*:* Versions 1.24 Vulnerable ·Tuxfamily
- cpe:2.3:a:tuxfamily:chrony:1.24:pre1:*:*:*:*:*:* Versions 1.24 pre1 Vulnerable ·Tuxfamily
- cpe:2.3:a:tuxfamily:chrony:1.25:*:*:*:*:*:*:* Versions 1.25 Vulnerable ·Tuxfamily
- cpe:2.3:a:tuxfamily:chrony:1.25:pre1:*:*:*:*:*:* Versions 1.25 pre1 Vulnerable ·Tuxfamily
- cpe:2.3:a:tuxfamily:chrony:1.25:pre2:*:*:*:*:*:* Versions 1.25 pre2 Vulnerable ·Tuxfamily
- cpe:2.3:a:tuxfamily:chrony:1.26:*:*:*:*:*:*:* Versions 1.26 Vulnerable ·Tuxfamily
- cpe:2.3:a:tuxfamily:chrony:1.26:pre1:*:*:*:*:*:* Versions 1.26 pre1 Vulnerable ·Tuxfamily
- cpe:2.3:a:tuxfamily:chrony:1.27:*:*:*:*:*:*:* Versions 1.27 Vulnerable ·Tuxfamily
- cpe:2.3:a:tuxfamily:chrony:1.27:pre1:*:*:*:*:*:* Versions 1.27 pre1 Vulnerable ·Tuxfamily
- cpe:2.3:a:tuxfamily:chrony:1.28:pre1:*:*:*:*:*:* Versions 1.28 pre1 Vulnerable ·Tuxfamily
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
Not affected: 1 product
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2012-4502
- 2026-10-03 Alias added: GHSA-93mp-m23x-f3x9
References
Patch 3
Advisory 1
More Tuxfamily Chrony vulnerabilities
- TI-2016-01428 chrony before 1.31.2 and 2.x before 2.2.1 do not verify peer associations of symmetric… CVSS 3.0HIGH 8.1
- TI-2015-01638 Heap-based buffer overflow in chrony before 1.31.1 allows remote authenticated users to… CVSS 2.0MEDIUM 6.5
- TI-2015-01639 chrony before 1.31.1 does not initialize the last "next" pointer when saving… CVSS 2.0MEDIUM 6.5
- TI-2015-01664 chrony before 1.31.1 does not properly protect state variables in authenticated symmetric… CVSS 3.1MEDIUM 6.5
- TI-2012-03845 cmdmon.c in Chrony before 1.29 allows remote attackers to obtain potentially sensitive… CVSS 2.0MEDIUM 5.0
- TI-2010-00281 chronyd in Chrony before 1.23.1, and possibly 1.24-pre1, generates a syslog message for… CVSS 2.0MEDIUM 5.0
Sources
- CVE-2012-4502 · CVE Program
- CVE-2012-4502 · NVD
- FIRST EPSS
- GHSA-93mp-m23x-f3x9 · GitHub Advisory Database · CC BY 4.0
- CVE-2012-4502 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences