CRITICAL KEV
exim: remote code execution flaw
Published Dec 14, 2010 ·Due Apr 15, 2022
9.8
CRITICALCVSS 3.1
EPSS 71.71%
Description
Heap-based buffer overflow in the string_vformat function in string.c in Exim before 4.70 allows remote attackers to execute arbitrary code via an SMTP session that includes two MAIL commands in conjunction with a large message containing crafted headers, leading to improper rejection logging.
Affected products
No data.
Configuration 2
Configuration 3
- 5.0
Configuration 4
OR
- 6.06
- 8.04
- 9.10
No data.
Red Hat Enterprise Linux 4
exim-0:4.43-1.RHEL4.5.el4_8.1
Fixed · RHSA-2010:0970
Red Hat Enterprise Linux 4.7 Z Stream
exim-0:4.43-1.RHEL4.5.el4_7.1
Fixed · RHSA-2010:0970
Red Hat Enterprise Linux 5
exim-0:4.63-5.el5_5.2
Fixed · RHSA-2010:0970
Red Hat Enterprise Linux 5.3.Z - Server Only
exim-0:4.63-3.el5_3.1
Fixed · RHSA-2010:0970
Red Hat Enterprise Linux 5.4.Z - Server Only
exim-0:4.63-3.el5_4.1
Fixed · RHSA-2010:0970
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | exim-0:4.43-1.RHEL4.5.el4_8.1 | Fixed | RHSA-2010:0970 |
| Red Hat Enterprise Linux 4.7 Z Stream | exim-0:4.43-1.RHEL4.5.el4_7.1 | Fixed | RHSA-2010:0970 |
| Red Hat Enterprise Linux 5 | exim-0:4.63-5.el5_5.2 | Fixed | RHSA-2010:0970 |
| Red Hat Enterprise Linux 5.3.Z - Server Only | exim-0:4.63-3.el5_3.1 | Fixed | RHSA-2010:0970 |
| Red Hat Enterprise Linux 5.4.Z - Server Only | exim-0:4.63-3.el5_4.1 | Fixed | RHSA-2010:0970 |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
9.8 CRITICAL NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
No CVSS v3.0 score for this CVE.
9.3 HIGH NVD
AV:N/AC:M/Au:N/C:C/I:C/A:C
Access Vector Network
Access Complexity Medium
Authentication None
Confidentiality Impact Complete
Integrity Impact Complete
Availability Impact Complete
Listed in CISA KEV KEV
Date Added
Mar 25, 2022
Patch Due
Apr 15, 2022
Required Action
Apply updates per vendor instructions.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
ActiveAutomatable
YesTechnical Impact
TotalDecision
n/aAssessed Feb 7, 2025 · SSVC 2.0.3
71.71% 0.71706
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
EPSS probability 0.71706
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 (21 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 71.71% (0.71706) | 99.41th | v5 (v2026.06.15) |
| Jun 15, 2026 | 71.79% (0.71794) | 99.34th | v5 (v2026.06.15) |
| May 7, 2026 | 51.87% (0.51873) | 97.92th | v4 (v2025.03.14) |
| Apr 19, 2026 | 53.06% (0.53064) | 97.97th | v4 (v2025.03.14) |
| Dec 28, 2025 | 61.46% (0.61461) | 98.24th | v4 (v2025.03.14) |
| Dec 27, 2025 | 74.82% (0.74818) | 98.82th | v4 (v2025.03.14) |
| Oct 28, 2025 | 61.46% (0.61461) | 98.22th | v4 (v2025.03.14) |
| Oct 27, 2025 | 74.82% (0.74818) | 98.81th | v4 (v2025.03.14) |
| Oct 1, 2025 | 61.46% (0.61461) | 98.28th | v4 (v2025.03.14) |
| Sep 16, 2025 | 74.82% (0.74818) | 98.83th | v4 (v2025.03.14) |
| Aug 24, 2025 | 71.28% (0.71276) | 98.65th | v4 (v2025.03.14) |
| Jul 30, 2025 | 67.61% (0.67611) | 98.50th | v4 (v2025.03.14) |
| Mar 30, 2025 | 57.47% (0.57471) | 97.97th | v4 (v2025.03.14) |
| Mar 29, 2025 | 75.47% (0.75465) | 98.56th | v4 (v2025.03.14) |
| Mar 17, 2025 | 61.80% (0.61802) | 98.16th | v4 (v2025.03.14) |
| Dec 17, 2024 | 83.97% (0.83965) | 98.69th | v3 (v2023.03.01) |
| Jul 17, 2024 | 74.97% (0.74965) | 98.18th | v3 (v2023.03.01) |
| Jun 14, 2023 | 93.07% (0.93069) | 98.58th | v3 (v2023.03.01) |
| Mar 7, 2023 | 92.79% (0.92788) | 98.42th | v3 (v2023.03.01) |
| Mar 6, 2023 | 47.94% (0.47944) | 98.60th | v2 (v2022.01.01) |
| Feb 4, 2022 | 47.94% (0.47944) | 98.10th | v2 (v2022.01.01) |
Weaknesses (2)
References (38)
- ftp://ftp.exim.org/pub/exim/ChangeLogs/ChangeLog-4.70 x_refsource_CONFIRMBroken Link
- http://atmail.com/blog/2010/atmail-6204-now-available/ x_refsource_CONFIRMBroken Link
- http://bugs.exim.org/show_bug.cgi?id=787 x_refsource_CONFIRMIssue TrackingPatch
- http://git.exim.org/exim.git/commit/24c929a27415c7cfc7126c47e4cad39acf3efa6b x_refsource_CONFIRMMailing ListPatch
- http://lists.exim.org/lurker/message/20101210.164935.385e04d0.en.html mailing-listx_refsource_MLISTMailing ListPatch
- http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00003.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://openwall.com/lists/oss-security/2010/12/10/1 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://secunia.com/advisories/40019 third-party-advisoryx_refsource_SECUNIABroken LinkVendor Advisory
- http://secunia.com/advisories/42576 third-party-advisoryx_refsource_SECUNIABroken LinkVendor Advisory
- http://secunia.com/advisories/42586 third-party-advisoryx_refsource_SECUNIABroken LinkVendor Advisory
- http://secunia.com/advisories/42587 third-party-advisoryx_refsource_SECUNIABroken LinkVendor Advisory
- http://secunia.com/advisories/42589 third-party-advisoryx_refsource_SECUNIABroken LinkVendor Advisory
- http://www.cpanel.net/2010/12/exim-remote-memory-corruption-vulnerability-notification-cve-2010-4344.html x_refsource_CONFIRMBroken Link
- http://www.debian.org/security/2010/dsa-2131 vendor-advisoryx_refsource_DEBIANMailing ListThird Party Advisory
- http://www.exim.org/lurker/message/20101207.215955.bb32d4f2.en.html mailing-listx_refsource_MLISTExploitMailing List
- http://www.kb.cert.org/vuls/id/682457 third-party-advisoryx_refsource_CERT-VNThird Party AdvisoryUS Government Resource
- http://www.metasploit.com/modules/exploit/unix/smtp/exim4_string_format x_refsource_MISCThird Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/04/7 mailing-listx_refsource_MLISTExploitMailing List
- http://www.osvdb.org/69685 vdb-entryx_refsource_OSVDBBroken LinkExploitPatch
- http://www.redhat.com/support/errata/RHSA-2010-0970.html vendor-advisoryx_refsource_REDHATBroken Link
- http://www.securityfocus.com/archive/1/515172/100/0/threaded mailing-listx_refsource_BUGTRAQBroken LinkThird Party AdvisoryVDB Entry
- http://www.securityfocus.com/bid/45308 vdb-entryx_refsource_BIDBroken LinkThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id?1024858 vdb-entryx_refsource_SECTRACKBroken LinkThird Party AdvisoryVDB Entry
- http://www.theregister.co.uk/2010/12/11/exim_code_execution_peril/ x_refsource_MISCPress/Media Coverage
- http://www.ubuntu.com/usn/USN-1032-1 vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- http://www.vupen.com/english/advisories/2010/3171 vdb-entryx_refsource_VUPENBroken LinkVendor Advisory
- http://www.vupen.com/english/advisories/2010/3172 vdb-entryx_refsource_VUPENBroken LinkVendor Advisory
- http://www.vupen.com/english/advisories/2010/3181 vdb-entryx_refsource_VUPENBroken LinkVendor Advisory
- http://www.vupen.com/english/advisories/2010/3186 vdb-entryx_refsource_VUPENBroken LinkVendor Advisory
- http://www.vupen.com/english/advisories/2010/3204 vdb-entryx_refsource_VUPENBroken LinkVendor Advisory
- http://www.vupen.com/english/advisories/2010/3246 vdb-entryx_refsource_VUPENBroken LinkVendor Advisory
- http://www.vupen.com/english/advisories/2010/3317 vdb-entryx_refsource_VUPENBroken Link
- https://access.redhat.com/security/cve/CVE-2010-4344 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=661756 x_refsource_CONFIRMExploitIssue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2010-4344
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2010-4344 government-resourceUS Government Resource
- https://www.cve.org/CVERecord?id=CVE-2010-4344
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner redhat
Published Dec 14, 2010
Updated Oct 22, 2025
Reserved Nov 30, 2010
Link CVE-2010-4344
CISA Vulnrichment
Updated Feb 7, 2025