CVE-2021-36386
report_vbuild in report.c in Fetchmail before 6.4.20 sometimes omits initialization of the vsnprintf va_list argument, which might allow mail servers to cause a denial of service or possibly have unspecified other impact via long error messages.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.56%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
report_vbuild in report.c in Fetchmail before 6.4.20 sometimes omits initialization of the vsnprintf va_list argument, which might allow mail servers to cause a denial of service or possibly have unspecified other impact via long error messages. NOTE: it is unclear whether use of Fetchmail on any realistic platform results in an impact beyond an inconvenience to the client user.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 2.56% probability · 84th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-909
- Affected
- fetchmail/fetchmail · fedoraproject/fedora
- Source
- cve@mitre.org
References
- http://www.openwall.com/lists/oss-security/2021/07/28/5Mailing List, Patch, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/08/09/1Mailing List
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AGYO5AHSXTCKA4NQC2Z4H3XMMYNAGC77/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OIXKO6QW3AUHGJVWKJXBCOVBYJUJRBFC/
- https://security.gentoo.org/glsa/202209-14Third Party Advisory
- https://www.fetchmail.info/fetchmail-SA-2021-01.txtVendor Advisory
- https://www.fetchmail.info/security.htmlVendor Advisory
- http://www.openwall.com/lists/oss-security/2021/07/28/5Mailing List, Patch, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/08/09/1Mailing List
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AGYO5AHSXTCKA4NQC2Z4H3XMMYNAGC77/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OIXKO6QW3AUHGJVWKJXBCOVBYJUJRBFC/
- https://security.gentoo.org/glsa/202209-14Third Party Advisory
- https://www.fetchmail.info/fetchmail-SA-2021-01.txtVendor Advisory
- https://www.fetchmail.info/security.htmlVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.