Exim up to 4.94.2 STARTTLS injection

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.0$0-$5k0.00

Summaryinfo

A vulnerability has been found in Exim up to 4.94.2 and classified as critical. The affected element is an unknown function of the component STARTTLS. This manipulation causes injection. This vulnerability is registered as CVE-2021-38371. No exploit is available.

Detailsinfo

A vulnerability classified as critical was found in Exim up to 4.94.2 (Mail Server Software). Affected by this vulnerability is an unknown part of the component STARTTLS. The manipulation with an unknown input leads to a injection vulnerability. The CWE definition for the vulnerability is CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was published 08/10/2021. The advisory is shared at exim.org. This vulnerability is known as CVE-2021-38371. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1055 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 209857 (Debian dla-3938 : exim4 - security update), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (209857). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.0
VulDB Meta Temp Score: 6.0

VulDB Base Score: 4.6
VulDB Temp Score: 4.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Injection
CWE: CWE-74 / CWE-707 / CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 209857
Nessus Name: Debian dla-3938 : exim4 - security update

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

08/10/2021 🔍
08/10/2021 +0 days 🔍
08/10/2021 +0 days 🔍
11/04/2025 +1547 days 🔍

Sourcesinfo

Advisory: exim.org
Status: Confirmed

CVE: CVE-2021-38371 (🔍)
GCVE (CVE): GCVE-0-2021-38371
GCVE (VulDB): GCVE-100-180505

Entryinfo

Created: 08/10/2021 21:16
Updated: 11/04/2025 06:42
Changes: 08/10/2021 21:16 (36), 08/15/2021 11:58 (2), 10/29/2024 12:58 (16), 11/04/2025 06:42 (19)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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