HOMEVULNERABILITIESCVE-2026-28753
LOW

CVE-2026-28753

CWE-93Published: March 24, 2026· Updated: Mar 26, 2026

3.7
CVSS v3.1
EPSS:0.02%probability of exploitation in 30 daysPercentile:3.9th

Official Description

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_mail_smtp_module module due to the improper handling of CRLF sequences in DNS responses. This allows an attacker-controlled DNS server to inject arbitrary headers into SMTP upstream requests, leading to potential request manipulation. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

NVD Source

Technical Analysis

CVE-2026-28753 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected Vendors & Products

f52 products
nginx plusnginx open source
Source: NVD CPE · 6 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://my.f5.com/manage/s/article/K000160367

All References (1)

→
https://my.f5.com/manage/s/article/K000160367Vendor Advisory

Quick Facts

CVE IDCVE-2026-28753
CVSS Score3.7 / 10
SeverityLOW
WeaknessCWE-93
CISA KEVNo
EPSS (30d)0.02%
Affected1 vendor
PublishedMar 24, 2026

Related CVEs (CWE-93)

CVE-2026-33128
10.0
CVE-2026-45372
9.9
CVE-2026-50292
9.8
CVE-2026-11362
9.8
CVE-2026-50638
9.1
CVE-2026-39958
9.1

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-28753 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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